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| author | Michael Niedermayer <michael@niedermayer.cc> | 2016-01-18 03:31:25 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2016-01-18 03:51:00 +0100 |
| commit | 89f464e9c229006e16f6bb5403c5529fdd0a9edd (patch) | |
| tree | 1a9e6ecfdc4ee656ce7e5619bdc908eef02663a3 /libavcodec | |
| parent | 9bc281beae6dbf5d5f03cae8865b377f3a61f4ff (diff) | |
| download | ffmpeg-89f464e9c229006e16f6bb5403c5529fdd0a9edd.tar.gz | |
avcodec/tiff: Check subsample & rps values more completely
Fixes out of array access
Fixes: 83aedfb29af669c4d6e10f1bfad974d2/asan_heap-oob_1ab42fe_4984_9f6ec14462f8d8a00ea24b320572a963.tif
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
Diffstat (limited to 'libavcodec')
| -rw-r--r-- | libavcodec/tiff.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/libavcodec/tiff.c b/libavcodec/tiff.c index d5c6398a17..4be587d569 100644 --- a/libavcodec/tiff.c +++ b/libavcodec/tiff.c @@ -1004,8 +1004,13 @@ static int tiff_decode_tag(TiffContext *s, AVFrame *frame) av_log(s->avctx, AV_LOG_ERROR, "subsample count invalid\n"); return AVERROR_INVALIDDATA; } - for (i = 0; i < count; i++) + for (i = 0; i < count; i++) { s->subsampling[i] = ff_tget(&s->gb, type, s->le); + if (s->subsampling[i] <= 0) { + av_log(s->avctx, AV_LOG_ERROR, "subsampling %d is invalid\n", s->subsampling[i]); + return AVERROR_INVALIDDATA; + } + } break; case TIFF_T4OPTIONS: if (s->compr == TIFF_G3) @@ -1253,7 +1258,7 @@ static int decode_frame(AVCodecContext *avctx, avpkt->size - s->strippos); } - if (s->rps <= 0) { + if (s->rps <= 0 || s->rps % s->subsampling[1]) { av_log(avctx, AV_LOG_ERROR, "rps %d invalid\n", s->rps); return AVERROR_INVALIDDATA; } |