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| author | Michael Niedermayer <michael@niedermayer.cc> | 2017-01-23 01:25:27 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2017-02-03 15:59:14 +0100 |
| commit | 99c78466ff27311b2a06d874cb7bbd8b1cefc597 (patch) | |
| tree | baf09426e9ab5b0e383e65e1c450334c1b3cecc5 | |
| parent | a6639334df63639ae333f81c43098ed8ee360ee9 (diff) | |
| download | ffmpeg-99c78466ff27311b2a06d874cb7bbd8b1cefc597.tar.gz | |
avcodec/pngdec: Fix off by 1 size in decode_zbuf()
Fixes out of array access
Fixes: 444/fuzz-2-ffmpeg_VIDEO_AV_CODEC_ID_PNG_fuzzer
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit e371f031b942d73e02c090170975561fabd5c264)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/pngdec.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/libavcodec/pngdec.c b/libavcodec/pngdec.c index 24318fbeaf..5443332277 100644 --- a/libavcodec/pngdec.c +++ b/libavcodec/pngdec.c @@ -437,13 +437,13 @@ static int decode_zbuf(AVBPrint *bp, const uint8_t *data, av_bprint_init(bp, 0, -1); while (zstream.avail_in > 0) { - av_bprint_get_buffer(bp, 1, &buf, &buf_size); - if (!buf_size) { + av_bprint_get_buffer(bp, 2, &buf, &buf_size); + if (buf_size < 2) { ret = AVERROR(ENOMEM); goto fail; } zstream.next_out = buf; - zstream.avail_out = buf_size; + zstream.avail_out = buf_size - 1; ret = inflate(&zstream, Z_PARTIAL_FLUSH); if (ret != Z_OK && ret != Z_STREAM_END) { ret = AVERROR_EXTERNAL; |