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| author | Michael Niedermayer <michael@niedermayer.cc> | 2017-06-04 22:37:47 +0300 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2017-06-16 02:05:29 +0300 |
| commit | 5c82f67012c33842a620315a6a73dfde57e504f1 (patch) | |
| tree | 740d1331da1d0175e9f624ab0f66a3fa38ab01e8 | |
| parent | 25b7dc959a087455834585d8e2c0c5a639f2d8e8 (diff) | |
avcodec/qdrw: Fix null pointer dereference
The RGB555 PACKBITSRGN case tries to read a palette, if such
palette is actually stored then it accesses a null pointer.
All 16bit samples i could find use DIRECTBITSRGN.
Fixes: 2065/clusterfuzz-testcase-minimized-6298930457346048
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 46b865ea9f86cbd12e1bf701913263c7932cccb0)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/qdrw.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/libavcodec/qdrw.c b/libavcodec/qdrw.c index 828cfea3fd..2cf18869e1 100644 --- a/libavcodec/qdrw.c +++ b/libavcodec/qdrw.c @@ -55,6 +55,8 @@ static int parse_palette(AVCodecContext *avctx, GetByteContext *gbc, bytestream2_skip(gbc, 6); continue; } + if (avctx->pix_fmt != AV_PIX_FMT_PAL8) + return AVERROR_INVALIDDATA; r = bytestream2_get_byte(gbc); bytestream2_skip(gbc, 1); g = bytestream2_get_byte(gbc); @@ -227,7 +229,9 @@ static int decode_frame(AVCodecContext *avctx, if ((ret = ff_get_buffer(avctx, p, 0)) < 0) return ret; - parse_palette(avctx, &gbc, (uint32_t *)p->data[1], colors); + ret = parse_palette(avctx, &gbc, (uint32_t *)p->data[1], colors); + if (ret < 0) + return ret; p->palette_has_changed = 1; /* jump to image data */ |