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| author | Michael Niedermayer <michael@niedermayer.cc> | 2017-01-24 22:21:25 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2017-01-24 23:01:04 +0100 |
| commit | 9e6a2427558a718be0c1fffacffd935f630a7a8d (patch) | |
| tree | f448b2d0e5e502c15d4bc5ab6ec4e4b2e5a86d69 /libavcodec/vp6.c | |
| parent | 9f10cff61042dbc0c27efd2dea7f1d3da83eff1b (diff) | |
| download | ffmpeg-9e6a2427558a718be0c1fffacffd935f630a7a8d.tar.gz | |
avcodec/vp56: Check for the bitstream end, pass error codes on
Fixes timeout
Fixes: 446/fuzz-3-ffmpeg_VIDEO_AV_CODEC_ID_VP6_fuzzer
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
Diffstat (limited to 'libavcodec/vp6.c')
| -rw-r--r-- | libavcodec/vp6.c | 17 |
1 files changed, 12 insertions, 5 deletions
diff --git a/libavcodec/vp6.c b/libavcodec/vp6.c index a2bb4578d5..7f0a9b7d5d 100644 --- a/libavcodec/vp6.c +++ b/libavcodec/vp6.c @@ -40,8 +40,8 @@ #define VP6_MAX_HUFF_SIZE 12 -static void vp6_parse_coeff(VP56Context *s); -static void vp6_parse_coeff_huffman(VP56Context *s); +static int vp6_parse_coeff(VP56Context *s); +static int vp6_parse_coeff_huffman(VP56Context *s); static int vp6_parse_header(VP56Context *s, const uint8_t *buf, int buf_size) { @@ -380,7 +380,7 @@ static unsigned vp6_get_nb_null(VP56Context *s) return val; } -static void vp6_parse_coeff_huffman(VP56Context *s) +static int vp6_parse_coeff_huffman(VP56Context *s) { VP56Model *model = s->modelp; uint8_t *permute = s->idct_scantable; @@ -402,7 +402,7 @@ static void vp6_parse_coeff_huffman(VP56Context *s) break; } else { if (get_bits_left(&s->gb) <= 0) - return; + return AVERROR_INVALIDDATA; coeff = get_vlc2(&s->gb, vlc_coeff->table, FF_HUFFMAN_BITS, 3); if (coeff == 0) { if (coeff_idx) { @@ -437,9 +437,10 @@ static void vp6_parse_coeff_huffman(VP56Context *s) vlc_coeff = &s->ract_vlc[pt][ct][cg]; } } + return 0; } -static void vp6_parse_coeff(VP56Context *s) +static int vp6_parse_coeff(VP56Context *s) { VP56RangeCoder *c = s->ccp; VP56Model *model = s->modelp; @@ -449,6 +450,11 @@ static void vp6_parse_coeff(VP56Context *s) int b, i, cg, idx, ctx; int pt = 0; /* plane type (0 for Y, 1 for U or V) */ + if (c->end >= c->buffer && c->bits >= 0) { + av_log(s->avctx, AV_LOG_ERROR, "End of AC stream reached in vp6_parse_coeff\n"); + return AVERROR_INVALIDDATA; + } + for (b=0; b<6; b++) { int ct = 1; /* code type */ int run = 1; @@ -512,6 +518,7 @@ static void vp6_parse_coeff(VP56Context *s) s->left_block[ff_vp56_b6to4[b]].not_null_dc = s->above_blocks[s->above_block_idx[b]].not_null_dc = !!s->block_coeff[b][0]; } + return 0; } static int vp6_block_variance(uint8_t *src, int stride) |