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| author | Michael Niedermayer <michael@niedermayer.cc> | 2023-01-11 23:26:06 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2023-03-16 14:48:37 +0100 |
| commit | 365203e99ec46695578776ab1afc16fbc207a6aa (patch) | |
| tree | e58c8f4df9494468f7b49ebbb51a0d1113244f38 | |
| parent | 14446f18315aada06808c89a521926c29ed07462 (diff) | |
| download | ffmpeg-365203e99ec46695578776ab1afc16fbc207a6aa.tar.gz | |
avcodec/pngdec: Check deloco index more exactly
Fixes: out of array access:
Fixes: 48567/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_PNG_fuzzer-6716193709096960
Alternatively it should be possible to limit this to 3 plane RGB 8 /16bit to ensure the size is what it should be
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 d5bae704068dc37191280e024eecb8d02b762b28)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/pngdec.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/libavcodec/pngdec.c b/libavcodec/pngdec.c index 5fa9491f9c..23e42aaf26 100644 --- a/libavcodec/pngdec.c +++ b/libavcodec/pngdec.c @@ -322,7 +322,7 @@ void ff_png_filter_row(PNGDSPContext *dsp, uint8_t *dst, int filter_type, static void deloco_ ## NAME(TYPE *dst, int size, int alpha) \ { \ int i; \ - for (i = 0; i < size; i += 3 + alpha) { \ + for (i = 0; i < size - 2; i += 3 + alpha) { \ int g = dst [i + 1]; \ dst[i + 0] += g; \ dst[i + 2] += g; \ |