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| author | Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com> | 2015-05-06 15:34:53 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2015-05-21 20:43:37 +0200 |
| commit | b8568c546e185f9528e129d0620cac2f80403ad1 (patch) | |
| tree | 9b9fd2b38ab88f2d3df0555fcd32b75cc26b75d6 | |
| parent | 7d58774360feb20339b68d6e955974f0d632afa4 (diff) | |
| download | ffmpeg-b8568c546e185f9528e129d0620cac2f80403ad1.tar.gz | |
diracdec: check that block length is valid
In init_planes p->xblen and p->yblen are set to:
p->xblen = s->plane[0].xblen >> s->chroma_x_shift;
p->yblen = s->plane[0].yblen >> s->chroma_y_shift;
These are later used as block_w and block_h arguments of
s->vdsp.emulated_edge_mc. If one of them is 0 it triggers an av_assert2
in emulated_edge_mc:
av_assert2(start_x < end_x && block_w > 0);
av_assert2(start_y < end_y && block_h > 0);
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 75fc81c8318505aa7946e05a9bee08d47241fc66)
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
| -rw-r--r-- | libavcodec/diracdec.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/libavcodec/diracdec.c b/libavcodec/diracdec.c index 966c358786..1bfe6be0a4 100644 --- a/libavcodec/diracdec.c +++ b/libavcodec/diracdec.c @@ -899,6 +899,14 @@ static int dirac_unpack_prediction_parameters(DiracContext *s) /*[DIRAC_STD] 11.2.4 motion_data_dimensions() Calculated in function dirac_unpack_block_motion_data */ + if (s->plane[0].xblen % (1 << s->chroma_x_shift) != 0 || + s->plane[0].yblen % (1 << s->chroma_y_shift) != 0 || + !s->plane[0].xblen || !s->plane[0].yblen) { + av_log(s->avctx, AV_LOG_ERROR, + "invalid x/y block length (%d/%d) for x/y chroma shift (%d/%d)\n", + s->plane[0].xblen, s->plane[0].yblen, s->chroma_x_shift, s->chroma_y_shift); + return AVERROR_INVALIDDATA; + } if (!s->plane[0].xbsep || !s->plane[0].ybsep || s->plane[0].xbsep < s->plane[0].xblen/2 || s->plane[0].ybsep < s->plane[0].yblen/2) { av_log(s->avctx, AV_LOG_ERROR, "Block separation too small\n"); return -1; |