media: cx25821: prevent out-of-bounds read on array card

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commit 67300abdbe upstream.

Currently an out of range dev->nr is detected by just reporting the
issue and later on an out-of-bounds read on array card occurs because
of this. Fix this by checking the upper range of dev->nr with the size
of array card (removes the hard coded size), move this check earlier
and also exit with the error -ENOSYS to avoid the later out-of-bounds
array read.

Detected by CoverityScan, CID#711191 ("Out-of-bounds-read")

Fixes: commit 02b20b0b4c ("V4L/DVB (12730): Add conexant cx25821 driver")

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
[hans.verkuil@cisco.com: %ld -> %zd]
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

...

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Colin Ian King 2018-01-31 12:33:09 -05:00 • committed by Ben Hutchings

parent d072a7f7f4

commit 8a8ab1e7fe

1 changed files with 4 additions and 3 deletions

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drivers/media/pci/cx25821/cx25821-core.c

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