media: dvb-usb-v2: gl861: Fix null-ptr-deref in gl861_i2c_master_xfer

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In gl861_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 gl861_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()")

Signed-off-by: Zhang Shurong <zhang_shurong@foxmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

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Zhang Shurong 2023-07-10 13:32:13 +08:00 • committed by Hans Verkuil

parent f7e0f1f524

commit b97719a669

1 changed files with 1 additions and 1 deletions

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drivers/media/usb/dvb-usb-v2/gl861.c

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