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Commit 14b94154 authored by Zhang Shurong's avatar Zhang Shurong Committed by Greg Kroah-Hartman
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media: anysee: fix null-ptr-deref in anysee_master_xfer



[ Upstream commit c3041126 ]

In anysee_master_xfer, msg is controlled by user. When msg[i].buf
is null and msg[i].len is zero, former checks on msg[i].buf would be
passed. Malicious data finally reach anysee_master_xfer. If accessing
msg[i].buf[0] without sanity check, null ptr deref would happen.
We add check on msg[i].len to prevent crash.

Similar commit:
commit 0ed554fd
("media: dvb-usb: az6027: fix null-ptr-deref in az6027_i2c_xfer()")

Signed-off-by: default avatarZhang Shurong <zhang_shurong@foxmail.com>
Signed-off-by: default avatarHans Verkuil <hverkuil-cisco@xs4all.nl>
[hverkuil: add spaces around +]
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent abb6fd93
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