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| author | Michael Niedermayer <michael@niedermayer.cc> | 2017-12-29 03:00:19 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2017-12-30 21:02:49 +0100 |
| commit | 903be5e4f66268273dc6e3c42a7fdeaab32066ef (patch) | |
| tree | f76bd56ae05a49d60bc5e6bbbf405426ad1f9e95 | |
| parent | c0b08ef94f037572876448990dca840b85432262 (diff) | |
| download | ffmpeg-903be5e4f66268273dc6e3c42a7fdeaab32066ef.tar.gz | |
avcodec/exr: Check buf_size more completely
Fixes: Out of heap array read
Fixes: 4683/clusterfuzz-testcase-minimized-6152313673613312
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/exr.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/libavcodec/exr.c b/libavcodec/exr.c index b1ecde4ebd..454dc74cfb 100644 --- a/libavcodec/exr.c +++ b/libavcodec/exr.c @@ -1051,7 +1051,7 @@ static int decode_block(AVCodecContext *avctx, void *tdata, line_offset = AV_RL64(s->gb.buffer + jobnr * 8); if (s->is_tile) { - if (line_offset > buf_size - 20) + if (buf_size < 20 || line_offset > buf_size - 20) return AVERROR_INVALIDDATA; src = buf + line_offset + 20; @@ -1062,7 +1062,7 @@ static int decode_block(AVCodecContext *avctx, void *tdata, tile_level_y = AV_RL32(src - 8); data_size = AV_RL32(src - 4); - if (data_size <= 0 || data_size > buf_size) + if (data_size <= 0 || data_size > buf_size - line_offset - 20) return AVERROR_INVALIDDATA; if (tile_level_x || tile_level_y) { /* tile level, is not the full res level */ @@ -1095,7 +1095,7 @@ static int decode_block(AVCodecContext *avctx, void *tdata, td->channel_line_size = td->xsize * s->current_channel_offset;/* uncompress size of one line */ uncompressed_size = td->channel_line_size * (uint64_t)td->ysize;/* uncompress size of the block */ } else { - if (line_offset > buf_size - 8) + if (buf_size < 8 || line_offset > buf_size - 8) return AVERROR_INVALIDDATA; src = buf + line_offset + 8; @@ -1105,7 +1105,7 @@ static int decode_block(AVCodecContext *avctx, void *tdata, return AVERROR_INVALIDDATA; data_size = AV_RL32(src - 4); - if (data_size <= 0 || data_size > buf_size) + if (data_size <= 0 || data_size > buf_size - line_offset - 8) return AVERROR_INVALIDDATA; td->ysize = FFMIN(s->scan_lines_per_block, s->ymax - line + 1); /* s->ydelta - line ?? */ |