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| author | Michael Niedermayer <michael@niedermayer.cc> | 2023-04-16 15:06:59 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2023-05-26 14:45:28 +0200 |
| commit | a207fbcdff47394761dcae94fee65ed45cbc5e50 (patch) | |
| tree | b98a3bc891e4f8e8d1f2bfd9fc28c1f1fa5a5ec1 | |
| parent | 4443cdbc92d36d65fedfdb709a8cf74bef6a64e7 (diff) | |
| download | ffmpeg-a207fbcdff47394761dcae94fee65ed45cbc5e50.tar.gz | |
avcodec/pngdec: Do not pass AVFrame into global header decode
The global header should not contain a frame, and decoding it
would result in leaks
Fixes: memleak
Fixes: 45982/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_APNG_fuzzer-6603443149340672
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit d31d4f32283f765c79d6e127d31ee2c37a0acef7)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/pngdec.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/libavcodec/pngdec.c b/libavcodec/pngdec.c index 8e666f648c..6de80f6314 100644 --- a/libavcodec/pngdec.c +++ b/libavcodec/pngdec.c @@ -621,6 +621,8 @@ static int decode_idat_chunk(AVCodecContext *avctx, PNGDecContext *s, int ret; size_t byte_depth = s->bit_depth > 8 ? 2 : 1; + if (!p) + return AVERROR_INVALIDDATA; if (!(s->hdr_state & PNG_IHDR)) { av_log(avctx, AV_LOG_ERROR, "IDAT without IHDR\n"); return AVERROR_INVALIDDATA; @@ -1295,6 +1297,8 @@ static int decode_frame_common(AVCodecContext *avctx, PNGDecContext *s, break; } case MKTAG('i', 'C', 'C', 'P'): { + if (!p) + return AVERROR_INVALIDDATA; if ((ret = decode_iccp_chunk(s, length, p)) < 0) goto fail; break; @@ -1353,6 +1357,9 @@ skip_tag: } exit_loop: + if (!p) + return AVERROR_INVALIDDATA; + if (avctx->codec_id == AV_CODEC_ID_PNG && avctx->skip_frame == AVDISCARD_ALL) { return 0; @@ -1499,7 +1506,7 @@ static int decode_frame_apng(AVCodecContext *avctx, s->zstream.zfree = ff_png_zfree; bytestream2_init(&s->gb, avctx->extradata, avctx->extradata_size); - if ((ret = decode_frame_common(avctx, s, p, avpkt)) < 0) + if ((ret = decode_frame_common(avctx, s, NULL, avpkt)) < 0) goto end; } |