[Linux-kernel-mentees] [PATCH v3] net/bluetooth: Fix slab-out-of-bounds read in hci_extended_inquiry_result_evt()

Marcel Holtmann marcel at holtmann.org
Fri Jul 10 17:08:51 UTC 2020


Hi Peilin,

> Check upon `num_rsp` is insufficient. A malformed event packet with a
> large `num_rsp` number makes hci_extended_inquiry_result_evt() go out
> of bounds. Fix it.
> 
> This patch fixes the following syzbot bug:
> 
>    https://syzkaller.appspot.com/bug?id=4bf11aa05c4ca51ce0df86e500fce486552dc8d2
> 
> Reported-by: syzbot+d8489a79b781849b9c46 at syzkaller.appspotmail.com
> Cc: stable at vger.kernel.org
> Signed-off-by: Peilin Ye <yepeilin.cs at gmail.com>
> ---
> Change in v3:
>    - Minimum `skb->len` requirement was 1 byte inaccurate since `info`
>      starts from `skb->data + 1`. Fix it.
> 
> Changes in v2:
>    - Use `skb->len` instead of `skb->truesize` as the length limit.
>    - Leave `num_rsp` as of type `int`.
> 
> net/bluetooth/hci_event.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)

patch has been applied to bluetooth-next tree.

Regards

Marcel



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