[PATCH v6 0/2] firmware_loader: fix uaf in firmware_fallback_sysfs
mail at anirudhrb.com
Thu Jul 22 12:32:27 UTC 2021
This series fixes the use after free in firmware_fallback_sysfs reported
by syzbot at:
The first patch does some cleanup of the error codes and documents
them properly. The second patch goes on to actually fix the bug.
Changes in v6:
1. v5 didn't actually remove -EAGAIN. So, fixed that.
Changes in v5:
1. Split the patch into two patches as discussed here:
Changes in v4:
Documented the reasons behind the error codes returned from
fw_sysfs_wait_timeout() as suggested by Luis Chamberlain.
Changes in v3:
Modified the patch to incorporate suggestions by Luis Chamberlain in
order to fix the root cause instead of applying a "band-aid" kind of
Changes in v2:
1. Fixed 1 error and 1 warning (in the commit message) reported by
checkpatch.pl. The error was regarding the format for referring to
another commit "commit <sha> ("oneline")". The warning was for line
longer than 75 chars.
Anirudh Rayabharam (2):
firmware_loader: use -ETIMEDOUT instead of -EAGAIN in
firmware_loader: fix use-after-free in firmware_fallback_sysfs
drivers/base/firmware_loader/fallback.c | 44 +++++++++++++++++--------
drivers/base/firmware_loader/firmware.h | 6 +++-
drivers/base/firmware_loader/main.c | 2 ++
3 files changed, 38 insertions(+), 14 deletions(-)
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