media: dvb-usb-v2: ce6230: fix null-ptr-deref in ce6230_i2c_master_xfer()

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[ Upstream commit dff9190901 ]

In ce6230_i2c_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 ce6230_i2c_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 0ed554fd76 ("media: dvb-usb: az6027: fix null-ptr-deref in az6027_i2c_xfer()")

Link: https://lore.kernel.org/linux-media/20230313092751.209496-1-harperchen1110@gmail.com
Signed-off-by: Wei Chen <harperchen1110@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Wei Chen 2023-03-13 09:27:51 +00:00 • committed by Greg Kroah-Hartman

parent 336ca9b371

commit 4e896b2263

1 changed files with 8 additions and 0 deletions

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drivers/media/usb/dvb-usb-v2/ce6230.c

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