media: cec: silence shift wrapping warning in __cec_s_log_addrs()

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The log_addrs->log_addr_type[i] value is a u8 which is controlled by
the user and comes from the ioctl.  If it's over 31 then that results in
undefined behavior (shift wrapping) and that leads to a Smatch static
checker warning.  We already cap the value later so we can silence the
warning just by re-ordering the existing checks.

I think the UBSan checker will also catch this bug at runtime and
generate a warning.  But otherwise the bug is harmless.

Fixes: 9881fe0ca1 ("[media] cec: add HDMI CEC framework (adapter)")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

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Dan Carpenter 2020-05-05 10:25:56 +02:00 • committed by Mauro Carvalho Chehab

parent 62eedb3561

commit 3b5af3171e

1 changed files with 4 additions and 4 deletions

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drivers/media/cec/core/cec-adap.c

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