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| author | Mauro Carvalho Chehab <mchehab+samsung@kernel.org> | 2019-08-22 11:46:40 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab+samsung@kernel.org> | 2019-08-26 14:03:39 -0300 |
| commit | 31b8b0bd6e55c3ea5a08bb8141fa5d3c90600e3b (patch) | |
| tree | ca19285893c27214fac3f6a122cc950865bcdbac | |
| parent | cb8045072a34d113e51fcd19cec74359b4e8daa9 (diff) | |
| download | linux-31b8b0bd6e55c3ea5a08bb8141fa5d3c90600e3b.tar.bz2 | |
media: aspeed-video: address a protential usage of an unitialized var
While this might not occur in practice, if the device is doing
the right thing, it would be teoretically be possible to have
both hsync_counter and vsync_counter negatives.
If this ever happen, ctrl will be undefined, but the driver
will still call:
aspeed_video_update(video, VE_CTRL, 0, ctrl);
Change the code to prevent this to happen.
This was warned by cppcheck:
[drivers/media/platform/aspeed-video.c:653]: (error) Uninitialized variable: ctrl
Reviewed-by: Eddie James <eajames@linux.ibm.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
| -rw-r--r-- | drivers/media/platform/aspeed-video.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/media/platform/aspeed-video.c b/drivers/media/platform/aspeed-video.c index 94f97d96dabc..eb12f3793062 100644 --- a/drivers/media/platform/aspeed-video.c +++ b/drivers/media/platform/aspeed-video.c @@ -630,7 +630,7 @@ static void aspeed_video_check_and_set_polarity(struct aspeed_video *video) } if (hsync_counter < 0 || vsync_counter < 0) { - u32 ctrl; + u32 ctrl = 0; if (hsync_counter < 0) { ctrl = VE_CTRL_HSYNC_POL; @@ -650,7 +650,8 @@ static void aspeed_video_check_and_set_polarity(struct aspeed_video *video) V4L2_DV_VSYNC_POS_POL; } - aspeed_video_update(video, VE_CTRL, 0, ctrl); + if (ctrl) + aspeed_video_update(video, VE_CTRL, 0, ctrl); } } |