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| author | Andreas Rheinhardt <andreas.rheinhardt@gmail.com> | 2020-09-15 03:03:18 +0200 |
|---|---|---|
| committer | Andreas Rheinhardt <andreas.rheinhardt@gmail.com> | 2020-09-15 19:25:26 +0200 |
| commit | e42fc6263379176869dd9a6467e37f9956d56431 (patch) | |
| tree | c3b3d082c6c5786418d13b6e189d1e13f01ba8af /libavcodec/mobiclip.c | |
| parent | b78031cf1670c176e97f62ad6a4865d3a44c1507 (diff) | |
avcodec/mobiclip: Fix heap-buffer-overflow
The MobiClip decoder uses adjacent pixels for prediction; yet when
accessing the left pixel, it was forgotten to clip the x coordinate.
This results in an heap-buffer-overflow. It can e.g. be reproduced with
the sample from https://samples.ffmpeg.org/V-codecs/MOHD/crap.avi when
forcing the video decoder to mobiclip.
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Diffstat (limited to 'libavcodec/mobiclip.c')
| -rw-r--r-- | libavcodec/mobiclip.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/libavcodec/mobiclip.c b/libavcodec/mobiclip.c index 8758e7f617..47387fce90 100644 --- a/libavcodec/mobiclip.c +++ b/libavcodec/mobiclip.c @@ -905,7 +905,7 @@ static int predict_intra(AVCodecContext *avctx, AVFrame *frame, int ax, int ay, int arr1[16]; int arr2[16]; uint8_t *top = frame->data[plane] + FFMAX(ay - 1, 0) * frame->linesize[plane] + ax; - uint8_t *left = frame->data[plane] + ay * frame->linesize[plane] + ax - 1; + uint8_t *left = frame->data[plane] + ay * frame->linesize[plane] + FFMAX(ax - 1, 0); int bottommost = frame->data[plane][(ay + size - 1) * frame->linesize[plane] + FFMAX(ax - 1, 0)]; int rightmost = frame->data[plane][FFMAX(ay - 1, 0) * frame->linesize[plane] + ax + size - 1]; int avg = (bottommost + rightmost + 1) / 2 + 2 * get_se_golomb(gb); |