[Linux-kernel-mentees] vidtv discussion
Daniel W. S. Almeida
dwlsalmeida at gmail.com
Thu Jul 30 16:01:28 UTC 2020
Hello Mauro & everyone :)
Here's the state of affairs for vidtv.
- Driver is modprobed without any errors on dmesg
- Using dvbv5-scan does not cause the driver to crash
- Driver feeds the demux with TS packets (PSI, PCR, AES3 audio
and NULL packets for padding), but the stream is not valid
yet.
- Kmemleak shows no leaks. UBSAN & KASAN pick up some bugs
- dvbv5-scan fails with: dvb_read_sections: no data read on section filter.
I am using this scan-file:
[Channel]
FREQUENCY = 330000000
MODULATION = QAM/AUTO
SYMBOL_RATE = 6940000
INNER_FEC = AUTO
DELIVERY_SYSTEM = DVBC/ANNEX_A
I find the information reported by UBSAN & KASAN a little bit off, to be
honest. KASAN reports a use after free but nothing crashes, and looking
at the code, I am not sure I agree with it.
The tuner expects an array with valid frequencies so it can simulate a
bad signal quality but so far no default exists in vidtv. What values
should I use?
Lastly, you'll notice that I left the range check commented out for the
buffer I am using in 'struct vidtv_mux'. That's because I'd like some
pointers on what values to use there. Please see
'static u32 vidtv_bridge_mux_buf_sz_for_mux_rate(void)' in vidtv_bridge.c
to get a feel about what I was thinking in order to keep a constant
mux rate.
dmesg for reference:
[ 55.322627] dvbdev: DVB: registering new adapter (dvb_vidtv_bridge)
[ 55.353586] i2c i2c-1: DVB: registering adapter 0 frontend 0 (Dummy
demod for DVB-T/T2/C/S/S2)...
[ 55.362569] dvb_vidtv_bridge:vidtv_bridge_probe, 458: Successfully
initialized vidtv!
[ 58.714772] ================================================================================
[ 58.714785] UBSAN: misaligned-access in drivers/media/test-drivers/vidtv/vidtv_psi.c:321:6
[ 58.714792] load of misaligned address 00000000214867d8 for type
'struct vidtv_psi_desc *'
[ 58.714794] which requires 8 byte alignment
[ 58.714799] CPU: 4 PID: 1316 Comm: dvbv5-scan Not tainted 5.8.0-rc6+ #12
[ 58.714800] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS
?-20200516_175120-felixonmars2 04/01/2014
[ 58.714802] Call Trace:
[ 58.714815] dump_stack+0x7d/0xb0
[ 58.714819] ubsan_epilogue+0x5/0x40
[ 58.714822] ubsan_type_mismatch_common.cold+0x47/0xcd
[ 58.714826] __ubsan_handle_type_mismatch_v1+0x32/0x37
[ 58.714834] vidtv_psi_desc_assign+0x50/0x80 [dvb_vidtv_bridge]
[ 58.714840] vidtv_channel_si_init+0x1d0/0x5d0 [dvb_vidtv_bridge]
[ 58.714848] vidtv_mux_init+0x1c0/0x660 [dvb_vidtv_bridge]
[ 58.714855] ? vidtv_mux_stop_thread+0xa0/0xa0 [dvb_vidtv_bridge]
[ 58.714861] ? vidtv_bridge_probe_tuner.constprop.0+0x230/0x230 [dvb_vidtv_bridge]
[ 58.714864] ? mutex_lock+0x89/0xd0
[ 58.714870] vidtv_start_feed+0x26a/0x400 [dvb_vidtv_bridge]
[ 58.714876] ? vidtv_bridge_probe_tuner.constprop.0+0x230/0x230 [dvb_vidtv_bridge]
[ 58.714881] ? vidtv_stop_feed+0x230/0x230 [dvb_vidtv_bridge]
[ 58.714887] ? vidtv_bridge_probe_tuner.constprop.0+0x230/0x230 [dvb_vidtv_bridge]
[ 58.714890] ? __mutex_lock_interruptible_slowpath+0x10/0x10
[ 58.714894] dmx_section_feed_start_filtering+0x194/0x260
[ 58.714899] dvb_dmxdev_filter_start+0x33b/0x570
[ 58.714902] dvb_demux_do_ioctl+0x6c3/0x871
[ 58.714906] dvb_usercopy+0x92/0x1d0
[ 58.714909] ? dvb_dmxdev_filter_start+0x570/0x570
[ 58.714912] ? dvb_remove_device+0xc0/0xc0
[ 58.714916] ? vfs_write+0x152/0x2c0
[ 58.714919] dvb_demux_ioctl+0xc/0x10
[ 58.714923] ksys_ioctl+0x95/0xd0
[ 58.714926] __x64_sys_ioctl+0x38/0x40
[ 58.714938] do_syscall_64+0x3e/0x70
[ 58.714941] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 58.714944] RIP: 0033:0x7fac76fa45d7
[ 58.714948] Code: b3 66 90 48 8b 05 b1 48 2d 00 64 c7 00 26 00 00 00
48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 b8 10 00 00 00 0f
05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 81 48 2d 00 f7 d8 64 89 01 48
[ 58.714949] RSP: 002b:00007ffe76a24658 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[ 58.714952] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007fac76fa45d7
[ 58.714954] RDX: 00007ffe76a24690 RSI: 00000000403c6f2b RDI: 0000000000000004
[ 58.714955] RBP: 55e63b88c230e77f R08: 0000000f5fa13c98 R09: 00007ffe76a51090
[ 58.714957] R10: 000000000001098e R11: 0000000000000246 R12: 00007ffe76a24690
[ 58.714959] R13: 0000000000000004 R14: 00007ffe76a24680 R15: 0000000000000001
[ 58.714960] ================================================================================
[ 58.714963] ================================================================================
[ 58.714966] UBSAN: misaligned-access in drivers/media/test-drivers/vidtv/vidtv_psi.c:324:6
[ 58.714969] store to misaligned address 00000000214867d8 for type
'struct vidtv_psi_desc *'
[ 58.714971] which requires 8 byte alignment
[ 58.714974] CPU: 4 PID: 1316 Comm: dvbv5-scan Not tainted 5.8.0-rc6+ #12
[ 58.714975] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS
?-20200516_175120-felixonmars2 04/01/2014
[ 58.714976] Call Trace:
[ 58.714980] dump_stack+0x7d/0xb0
[ 58.714982] ubsan_epilogue+0x5/0x40
[ 58.714986] ubsan_type_mismatch_common.cold+0x47/0xcd
[ 58.714989] __ubsan_handle_type_mismatch_v1+0x32/0x37
[ 58.714995] vidtv_psi_desc_assign+0x61/0x80 [dvb_vidtv_bridge]
[ 58.715001] vidtv_channel_si_init+0x1d0/0x5d0 [dvb_vidtv_bridge]
[ 58.715007] vidtv_mux_init+0x1c0/0x660 [dvb_vidtv_bridge]
[ 58.715013] ? vidtv_mux_stop_thread+0xa0/0xa0 [dvb_vidtv_bridge]
[ 58.715018] ? vidtv_bridge_probe_tuner.constprop.0+0x230/0x230 [dvb_vidtv_bridge]
[ 58.715021] ? mutex_lock+0x89/0xd0
[ 58.715027] vidtv_start_feed+0x26a/0x400 [dvb_vidtv_bridge]
[ 58.715032] ? vidtv_bridge_probe_tuner.constprop.0+0x230/0x230 [dvb_vidtv_bridge]
[ 58.715038] ? vidtv_stop_feed+0x230/0x230 [dvb_vidtv_bridge]
[ 58.715043] ? vidtv_bridge_probe_tuner.constprop.0+0x230/0x230 [dvb_vidtv_bridge]
[ 58.715046] ? __mutex_lock_interruptible_slowpath+0x10/0x10
[ 58.715049] dmx_section_feed_start_filtering+0x194/0x260
[ 58.715053] dvb_dmxdev_filter_start+0x33b/0x570
[ 58.715057] dvb_demux_do_ioctl+0x6c3/0x871
[ 58.715060] dvb_usercopy+0x92/0x1d0
[ 58.715063] ? dvb_dmxdev_filter_start+0x570/0x570
[ 58.715066] ? dvb_remove_device+0xc0/0xc0
[ 58.715069] ? vfs_write+0x152/0x2c0
[ 58.715072] dvb_demux_ioctl+0xc/0x10
[ 58.715075] ksys_ioctl+0x95/0xd0
[ 58.715078] __x64_sys_ioctl+0x38/0x40
[ 58.715081] do_syscall_64+0x3e/0x70
[ 58.715087] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 58.715090] RIP: 0033:0x7fac76fa45d7
[ 58.715093] Code: b3 66 90 48 8b 05 b1 48 2d 00 64 c7 00 26 00 00 00
48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 b8 10 00 00 00 0f
05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 81 48 2d 00 f7 d8 64 89 01 48
[ 58.715094] RSP: 002b:00007ffe76a24658 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[ 58.715097] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007fac76fa45d7
[ 58.715098] RDX: 00007ffe76a24690 RSI: 00000000403c6f2b RDI: 0000000000000004
[ 58.715100] RBP: 55e63b88c230e77f R08: 0000000f5fa13c98 R09: 00007ffe76a51090
[ 58.715101] R10: 000000000001098e R11: 0000000000000246 R12: 00007ffe76a24690
[ 58.715103] R13: 0000000000000004 R14: 00007ffe76a24680 R15: 0000000000000001
[ 58.715105] ================================================================================
[ 58.715292] ================================================================================
[ 58.715295] UBSAN: misaligned-access in drivers/media/test-drivers/vidtv/vidtv_psi.c:321:6
[ 58.715298] load of misaligned address 00000000f5ef6dd7 for type
'struct vidtv_psi_desc *'
[ 58.715300] which requires 8 byte alignment
[ 58.715303] CPU: 4 PID: 1316 Comm: dvbv5-scan Not tainted 5.8.0-rc6+ #12
[ 58.715305] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS
?-20200516_175120-felixonmars2 04/01/2014
[ 58.715305] Call Trace:
[ 58.715309] dump_stack+0x7d/0xb0
[ 58.715312] ubsan_epilogue+0x5/0x40
[ 58.715315] ubsan_type_mismatch_common.cold+0x47/0xcd
[ 58.715318] __ubsan_handle_type_mismatch_v1+0x32/0x37
[ 58.715324] vidtv_pmt_desc_assign+0x5e/0x90 [dvb_vidtv_bridge]
[ 58.715330] vidtv_channels_add_registration_descs+0x1c5/0x2b0 [dvb_vidtv_bridge]
[ 58.715336] vidtv_mux_init+0x4eb/0x660 [dvb_vidtv_bridge]
[ 58.715342] ? vidtv_mux_stop_thread+0xa0/0xa0 [dvb_vidtv_bridge]
[ 58.715348] ? vidtv_bridge_probe_tuner.constprop.0+0x230/0x230 [dvb_vidtv_bridge]
[ 58.715350] ? mutex_lock+0x89/0xd0
[ 58.715356] vidtv_start_feed+0x26a/0x400 [dvb_vidtv_bridge]
[ 58.715362] ? vidtv_bridge_probe_tuner.constprop.0+0x230/0x230 [dvb_vidtv_bridge]
[ 58.715367] ? vidtv_stop_feed+0x230/0x230 [dvb_vidtv_bridge]
[ 58.715373] ? vidtv_bridge_probe_tuner.constprop.0+0x230/0x230 [dvb_vidtv_bridge]
[ 58.715376] ? __mutex_lock_interruptible_slowpath+0x10/0x10
[ 58.715378] dmx_section_feed_start_filtering+0x194/0x260
[ 58.715382] dvb_dmxdev_filter_start+0x33b/0x570
[ 58.715386] dvb_demux_do_ioctl+0x6c3/0x871
[ 58.715389] dvb_usercopy+0x92/0x1d0
[ 58.715392] ? dvb_dmxdev_filter_start+0x570/0x570
[ 58.715395] ? dvb_remove_device+0xc0/0xc0
[ 58.715398] ? vfs_write+0x152/0x2c0
[ 58.715402] dvb_demux_ioctl+0xc/0x10
[ 58.715404] ksys_ioctl+0x95/0xd0
[ 58.715407] __x64_sys_ioctl+0x38/0x40
[ 58.715410] do_syscall_64+0x3e/0x70
[ 58.715413] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 58.715415] RIP: 0033:0x7fac76fa45d7
[ 58.715418] Code: b3 66 90 48 8b 05 b1 48 2d 00 64 c7 00 26 00 00 00
48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 b8 10 00 00 00 0f
05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 81 48 2d 00 f7 d8 64 89 01 48
[ 58.715419] RSP: 002b:00007ffe76a24658 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[ 58.715422] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007fac76fa45d7
[ 58.715423] RDX: 00007ffe76a24690 RSI: 00000000403c6f2b RDI: 0000000000000004
[ 58.715425] RBP: 55e63b88c230e77f R08: 0000000f5fa13c98 R09: 00007ffe76a51090
[ 58.715426] R10: 000000000001098e R11: 0000000000000246 R12: 00007ffe76a24690
[ 58.715428] R13: 0000000000000004 R14: 00007ffe76a24680 R15: 0000000000000001
[ 58.715429] ================================================================================
[ 58.715432] ================================================================================
[ 58.715434] UBSAN: misaligned-access in drivers/media/test-drivers/vidtv/vidtv_psi.c:324:6
[ 58.715440] store to misaligned address 00000000f5ef6dd7 for type
'struct vidtv_psi_desc *'
[ 58.715443] which requires 8 byte alignment
[ 58.715446] CPU: 4 PID: 1316 Comm: dvbv5-scan Not tainted 5.8.0-rc6+ #12
[ 58.715447] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS
?-20200516_175120-felixonmars2 04/01/2014
[ 58.715448] Call Trace:
[ 58.715451] dump_stack+0x7d/0xb0
[ 58.715454] ubsan_epilogue+0x5/0x40
[ 58.715457] ubsan_type_mismatch_common.cold+0x47/0xcd
[ 58.715460] __ubsan_handle_type_mismatch_v1+0x32/0x37
[ 58.715466] vidtv_pmt_desc_assign+0x6f/0x90 [dvb_vidtv_bridge]
[ 58.715473] vidtv_channels_add_registration_descs+0x1c5/0x2b0 [dvb_vidtv_bridge]
[ 58.715479] vidtv_mux_init+0x4eb/0x660 [dvb_vidtv_bridge]
[ 58.715485] ? vidtv_mux_stop_thread+0xa0/0xa0 [dvb_vidtv_bridge]
[ 58.715490] ? vidtv_bridge_probe_tuner.constprop.0+0x230/0x230 [dvb_vidtv_bridge]
[ 58.715493] ? mutex_lock+0x89/0xd0
[ 58.715498] vidtv_start_feed+0x26a/0x400 [dvb_vidtv_bridge]
[ 58.715504] ? vidtv_bridge_probe_tuner.constprop.0+0x230/0x230 [dvb_vidtv_bridge]
[ 58.715510] ? vidtv_stop_feed+0x230/0x230 [dvb_vidtv_bridge]
[ 58.715515] ? vidtv_bridge_probe_tuner.constprop.0+0x230/0x230 [dvb_vidtv_bridge]
[ 58.715518] ? __mutex_lock_interruptible_slowpath+0x10/0x10
[ 58.715521] dmx_section_feed_start_filtering+0x194/0x260
[ 58.715525] dvb_dmxdev_filter_start+0x33b/0x570
[ 58.715528] dvb_demux_do_ioctl+0x6c3/0x871
[ 58.715532] dvb_usercopy+0x92/0x1d0
[ 58.715535] ? dvb_dmxdev_filter_start+0x570/0x570
[ 58.715538] ? dvb_remove_device+0xc0/0xc0
[ 58.715541] ? vfs_write+0x152/0x2c0
[ 58.715544] dvb_demux_ioctl+0xc/0x10
[ 58.715547] ksys_ioctl+0x95/0xd0
[ 58.715550] __x64_sys_ioctl+0x38/0x40
[ 58.715553] do_syscall_64+0x3e/0x70
[ 58.715556] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 58.715558] RIP: 0033:0x7fac76fa45d7
[ 58.715560] Code: b3 66 90 48 8b 05 b1 48 2d 00 64 c7 00 26 00 00 00
48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 b8 10 00 00 00 0f
05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 81 48 2d 00 f7 d8 64 89 01 48
[ 58.715562] RSP: 002b:00007ffe76a24658 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[ 58.715564] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007fac76fa45d7
[ 58.715565] RDX: 00007ffe76a24690 RSI: 00000000403c6f2b RDI: 0000000000000004
[ 58.715567] RBP: 55e63b88c230e77f R08: 0000000f5fa13c98 R09: 00007ffe76a51090
[ 58.715569] R10: 000000000001098e R11: 0000000000000246 R12: 00007ffe76a24690
[ 58.715570] R13: 0000000000000004 R14: 00007ffe76a24680 R15: 0000000000000001
[ 58.715572] ================================================================================
[ 58.715580] dvb_vidtv_bridge:vidtv_start_streaming, 170: Started streaming
[ 59.715128] ==================================================================
[ 59.715149] BUG: KASAN: use-after-free in
vidtv_mux_destroy+0x15c/0x356 [dvb_vidtv_bridge]
[ 59.715156] Read of size 8 at addr ffff88806bcd4888 by task dvbv5-scan/1316
[ 59.715165] CPU: 4 PID: 1316 Comm: dvbv5-scan Not tainted 5.8.0-rc6+ #12
[ 59.715168] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS
?-20200516_175120-felixonmars2 04/01/2014
[ 59.715170] Call Trace:
[ 59.715178] dump_stack+0x7d/0xb0
[ 59.715196] print_address_description.constprop.0+0x1a/0x210
[ 59.715202] ? _raw_spin_lock_irqsave+0x7b/0xd0
[ 59.715207] ? _raw_write_lock_irqsave+0xd0/0xd0
[ 59.715211] ? rcu_segcblist_enqueue+0x56/0x70
[ 59.715219] ? vidtv_mux_destroy+0x15c/0x356 [dvb_vidtv_bridge]
[ 59.715222] kasan_report.cold+0x37/0x7c
[ 59.715229] ? vidtv_mux_destroy+0x15c/0x356 [dvb_vidtv_bridge]
[ 59.715236] vidtv_mux_destroy+0x15c/0x356 [dvb_vidtv_bridge]
[ 59.715242] ? detach_if_pending+0x160/0x160
[ 59.715251] vidtv_stop_feed+0x112/0x230 [dvb_vidtv_bridge]
[ 59.715257] dmx_section_feed_stop_filtering+0x54/0xc0
[ 59.715270] dvb_dmxdev_filter_stop.part.0+0x10b/0x170
[ 59.715276] dvb_demux_do_ioctl+0x285/0x871
[ 59.715282] dvb_usercopy+0x92/0x1d0
[ 59.715288] ? dvb_remove_device+0xc0/0xc0
[ 59.715292] ? tty_write+0x2fe/0x430
[ 59.715296] ? vfs_write+0x152/0x2c0
[ 59.715300] dvb_demux_ioctl+0xc/0x10
[ 59.715304] ksys_ioctl+0x95/0xd0
[ 59.715307] __x64_sys_ioctl+0x38/0x40
[ 59.715310] do_syscall_64+0x3e/0x70
[ 59.715313] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 59.715316] RIP: 0033:0x7fac76fa45d7
[ 59.715320] Code: b3 66 90 48 8b 05 b1 48 2d 00 64 c7 00 26 00 00 00
48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 b8 10 00 00 00 0f
05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 81 48 2d 00 f7 d8 64 89 01 48
[ 59.715322] RSP: 002b:00007ffe76a246d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[ 59.715325] RAX: ffffffffffffffda RBX: 55e63b88c230e77f RCX: 00007fac76fa45d7
[ 59.715326] RDX: 0000000000010d3e RSI: 0000000000006f2a RDI: 0000000000000004
[ 59.715328] RBP: 0000000000000004 R08: 0000000fa11c7fc7 R09: 00007ffe76a51090
[ 59.715330] R10: 0000000000010d3e R11: 0000000000000246 R12: 00007ffe76a246f0
[ 59.715331] R13: 0000000000000010 R14: 0000000000000004 R15: 0000000000000001
[ 59.715336] Allocated by task 1316:
[ 59.715340] save_stack+0x1b/0x40
[ 59.715343] __kasan_kmalloc.constprop.0+0xc2/0xd0
[ 59.715349] vidtv_mux_create_pid_ctx_once.part.0+0x31/0x190 [dvb_vidtv_bridge]
[ 59.715354] vidtv_mux_init+0x55c/0x660 [dvb_vidtv_bridge]
[ 59.715359] vidtv_start_feed+0x26a/0x400 [dvb_vidtv_bridge]
[ 59.715361] dmx_section_feed_start_filtering+0x194/0x260
[ 59.715364] dvb_dmxdev_filter_start+0x33b/0x570
[ 59.715367] dvb_demux_do_ioctl+0x6c3/0x871
[ 59.715369] dvb_usercopy+0x92/0x1d0
[ 59.715372] dvb_demux_ioctl+0xc/0x10
[ 59.715374] ksys_ioctl+0x95/0xd0
[ 59.715377] __x64_sys_ioctl+0x38/0x40
[ 59.715379] do_syscall_64+0x3e/0x70
[ 59.715382] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 59.715384] Freed by task 1316:
[ 59.715388] save_stack+0x1b/0x40
[ 59.715390] __kasan_slab_free+0x12d/0x170
[ 59.715393] kfree+0x9f/0x240
[ 59.715398] vidtv_mux_destroy+0x14b/0x356 [dvb_vidtv_bridge]
[ 59.715403] vidtv_stop_feed+0x112/0x230 [dvb_vidtv_bridge]
[ 59.715405] dmx_section_feed_stop_filtering+0x54/0xc0
[ 59.715408] dvb_dmxdev_filter_stop.part.0+0x10b/0x170
[ 59.715411] dvb_demux_do_ioctl+0x285/0x871
[ 59.715413] dvb_usercopy+0x92/0x1d0
[ 59.715416] dvb_demux_ioctl+0xc/0x10
[ 59.715418] ksys_ioctl+0x95/0xd0
[ 59.715421] __x64_sys_ioctl+0x38/0x40
[ 59.715423] do_syscall_64+0x3e/0x70
[ 59.715426] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 59.715429] The buggy address belongs to the object at ffff88806bcd4880
[ 59.715429] which belongs to the cache kmalloc-32 of size 32
[ 59.715433] The buggy address is located 8 bytes inside of
[ 59.715433] 32-byte region [ffff88806bcd4880, ffff88806bcd48a0)
[ 59.715435] The buggy address belongs to the page:
[ 59.715439] page:ffffea0001af3500 refcount:1 mapcount:0
mapping:0000000000000000 index:0x0
[ 59.715446] flags: 0x100000000000200(slab)
[ 59.715451] raw: 0100000000000200 0000000000000000 0000000100000001 ffff88806cc03a40
[ 59.715454] raw: 0000000000000000 0000000080400040 00000001ffffffff 0000000000000000
[ 59.715455] page dumped because: kasan: bad access detected
[ 59.715457] Memory state around the buggy address:
[ 59.715461] ffff88806bcd4780: fb fb fb fb fc fc fc fc 00 00 00 fc fc
fc fc fc
[ 59.715464] ffff88806bcd4800: 00 00 00 fc fc fc fc fc 00 00 00 fc fc
fc fc fc
[ 59.715467] >ffff88806bcd4880: fb fb fb fb fc fc fc fc fb fb fb fb fc
fc fc fc
[ 59.715469] ^
[ 59.715472] ffff88806bcd4900: 00 00 00 fc fc fc fc fc 00 00 00 fc fc
fc fc fc
[ 59.715475] ffff88806bcd4980: 00 00 05 fc fc fc fc fc 00 00 00 04 fc
fc fc fc
[ 59.715477] ==================================================================
[ 59.715482] Disabling lock debugging due to kernel taint
[ 59.715661] dvb_vidtv_bridge:vidtv_stop_streaming, 181: Stopped streaming
--thanks
- Daniel
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