diff options
| author | Prashant Laddha <prladdha@cisco.com> | 2015-04-22 14:32:36 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@osg.samsung.com> | 2015-05-01 07:15:06 -0300 |
| commit | 947ed99e5d1b1595312a320fb9db4f52965ceeae (patch) | |
| tree | 0a33cd65467af1fb328b94824f897a02b1a7a9a1 /drivers/media/v4l2-core | |
| parent | d7ed5a3ddaec19d866ffc05ed2733179fbe4da9e (diff) | |
[media] v4l2-dv-timings: add sanity checks in cvt,gtf calculations
Wrong values of hfreq and image height can lead to strange timings.
Avoid timing calculations for such values.
Suggested By: Martin Bugge <marbugge@cisco.com>
Cc: Martin Bugge <marbugge@cisco.com>
Signed-off-by: Prashant Laddha <prladdha@cisco.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Diffstat (limited to 'drivers/media/v4l2-core')
| -rw-r--r-- | drivers/media/v4l2-core/v4l2-dv-timings.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/media/v4l2-core/v4l2-dv-timings.c b/drivers/media/v4l2-core/v4l2-dv-timings.c index 16c8ac5b5e0b..4e09792038ed 100644 --- a/drivers/media/v4l2-core/v4l2-dv-timings.c +++ b/drivers/media/v4l2-core/v4l2-dv-timings.c @@ -365,6 +365,9 @@ bool v4l2_detect_cvt(unsigned frame_height, unsigned hfreq, unsigned vsync, else return false; + if (hfreq == 0) + return false; + /* Vertical */ if (reduced_blanking) { v_fp = CVT_RB_V_FPORCH; @@ -382,6 +385,9 @@ bool v4l2_detect_cvt(unsigned frame_height, unsigned hfreq, unsigned vsync, } image_height = (frame_height - v_fp - vsync - v_bp + 1) & ~0x1; + if (image_height < 0) + return false; + /* Aspect ratio based on vsync */ switch (vsync) { case 4: @@ -527,12 +533,18 @@ bool v4l2_detect_gtf(unsigned frame_height, else return false; + if (hfreq == 0) + return false; + /* Vertical */ v_fp = GTF_V_FP; v_bp = (GTF_MIN_VSYNC_BP * hfreq + 500000) / 1000000 - vsync; image_height = (frame_height - v_fp - vsync - v_bp + 1) & ~0x1; + if (image_height < 0) + return false; + if (aspect.numerator == 0 || aspect.denominator == 0) { aspect.numerator = 16; aspect.denominator = 9; |