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Subject: media: venus: fix loop wrap in cleanup of clks
Author:  Colin Ian King <colin.k...@canonical.com>
Date:    Thu Jun 22 14:27:21 2017 -0300

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.k...@canonical.com>
Signed-off-by: Hans Verkuil <hansv...@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mche...@s-opensource.com>

 drivers/media/platform/qcom/venus/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

---

diff --git a/drivers/media/platform/qcom/venus/core.c 
b/drivers/media/platform/qcom/venus/core.c
index 776d2bae6979..d8cbe8549d97 100644
--- a/drivers/media/platform/qcom/venus/core.c
+++ b/drivers/media/platform/qcom/venus/core.c
@@ -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;

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