diff options
| author | Michael Niedermayer <michael@niedermayer.cc> | 2017-01-23 01:25:27 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2017-08-23 13:15:16 +0200 |
| commit | 62244f37d116af28949787d160f80f5210083e55 (patch) | |
| tree | 1e03c1fb241075a3e59ef441f0c3b87b2a65577e | |
| parent | 14e5d6a009ea7927a8615b6e253a27ca248708ff (diff) | |
| download | ffmpeg-62244f37d116af28949787d160f80f5210083e55.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 8c22da0d78..986cde3719 100644 --- a/libavcodec/pngdec.c +++ b/libavcodec/pngdec.c @@ -421,13 +421,13 @@ 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; |