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| author | Michael Niedermayer <michael@niedermayer.cc> | 2017-01-23 01:25:27 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2017-01-26 00:34:12 +0100 |
| commit | bd6c1d5149fbc4f2a0200ad99e7f56f4fb7d518a (patch) | |
| tree | 9c9fae9f6b4600ec56e30f2d3bde0e5b922a342c | |
| parent | 41fc098a8612ba1af98ea0713c929a1f32f3ae87 (diff) | |
| download | ffmpeg-bd6c1d5149fbc4f2a0200ad99e7f56f4fb7d518a.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 36275ae43f..7ade0cee66 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; |