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media: venus: fix loop wrap in cleanup of clks

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The current pre-decrement is incorrect and should be replaced
with a post-decrement. Consider the case where the very first
clk_prepare_enable fails when i is 0; in this case the error
clean up will decrement the unsigned int which wraps to the
largest unsigned int value causing an array out of bounds read
on core->clks[i].

Detected by CoverityScan, CID#1446590 ("Out-of-bounds read")

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Hans Verkuil <hansverk@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Colin Ian King 2017-06-22 14:27:21 -03:00 committed by Mauro Carvalho Chehab
parent 13c2bede49
commit bc8e2d627a
1 changed files with 1 additions and 1 deletions
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2
drivers/media/platform/qcom/venus/core.c
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@ -137,7 +137,7 @@ static int venus_clks_enable(struct venus_core *core)
return 0;
err:
while (--i)
while (i--)
clk_disable_unprepare(core->clks[i]);
return ret;