media: dvb-usb-v2: af9035: Fix null-ptr-deref in af9035_i2c_master_xfer
[ Upstream commit 7bf744f2 ] In af9035_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 af9035_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 0ed554fd ("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> Signed-off-by:
Sasha Levin <sashal@kernel.org> [ moved variable declaration to fix build issues in older kernels - gregkh ] Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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7ffe14fc
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