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avcodec/rscc: Check that the to be uncompressed input is large enough 

Fixes: Out of array access
Fixes: 13984/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_RSCC_fuzzer-5734128093233152

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-03-31 17:31:17 +02:00
parent 27c94c57dc
commit 3a0ec1511e
1 changed files with 6 additions and 0 deletions
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6
libavcodec/rscc.c
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@ -199,6 +199,12 @@ static int rscc_decode_frame(AVCodecContext *avctx, void *data,
/* If necessary, uncompress tiles, and hijack the bytestream reader */
if (packed_tiles_size != tiles_nb * TILE_SIZE) {
uLongf length = tiles_nb * TILE_SIZE;
if (bytestream2_get_bytes_left(gbc) < packed_tiles_size) {
ret = AVERROR_INVALIDDATA;
goto end;
}
inflated_tiles = av_malloc(length);
if (!inflated_tiles) {
ret = AVERROR(ENOMEM);