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| author | Michael Niedermayer <michael@niedermayer.cc> | 2023-01-12 00:29:02 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2023-03-16 14:48:37 +0100 |
| commit | ac3e0e7beb7f5d053691f378928cd6e97c2c95f5 (patch) | |
| tree | 681e25291ff6d404a86d82ea836937d6526d470b | |
| parent | ce0bb67b1fda5e95ee438471c8ffc06b977b8ef2 (diff) | |
| download | ffmpeg-ac3e0e7beb7f5d053691f378928cd6e97c2c95f5.tar.gz | |
avcodec/videodsp_template: Adjust pointers to avoid undefined pointer things
Fixes: subtraction of unsigned offset from 0xf6602770 overflowed to 0xf6638c80
Fixes: 48567/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_THEORA_fuzzer-495074400600064
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 f0150cd41c2d3c01050a6c4f3df1de511a217913)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/videodsp_template.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/libavcodec/videodsp_template.c b/libavcodec/videodsp_template.c index 324d70f2cb..d653f4d524 100644 --- a/libavcodec/videodsp_template.c +++ b/libavcodec/videodsp_template.c @@ -64,7 +64,7 @@ void FUNC(ff_emulated_edge_mc)(uint8_t *buf, const uint8_t *src, av_assert2(start_x < end_x && block_w); w = end_x - start_x; - src += start_y * src_linesize + start_x * sizeof(pixel); + src += start_y * src_linesize + start_x * (ptrdiff_t)sizeof(pixel); buf += start_x * sizeof(pixel); // top @@ -87,7 +87,7 @@ void FUNC(ff_emulated_edge_mc)(uint8_t *buf, const uint8_t *src, buf += buf_linesize; } - buf -= block_h * buf_linesize + start_x * sizeof(pixel); + buf -= block_h * buf_linesize + start_x * (ptrdiff_t)sizeof(pixel); while (block_h--) { pixel *bufp = (pixel *) buf; |