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| author | Michael Niedermayer <michael@niedermayer.cc> | 2018-05-04 18:16:08 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2018-05-06 21:02:04 +0200 |
| commit | 0a4745145840d97619c424961c1b5c625dbf516c (patch) | |
| tree | a1ccecff5496981eb455e21dd5c60041db869bc2 | |
| parent | 8d1263fa199ff6dcfc8f0cc94f15f3b429d0c276 (diff) | |
| download | ffmpeg-0a4745145840d97619c424961c1b5c625dbf516c.tar.gz | |
avcodec/g2meet: Change order of operations to avoid undefined behavior
Fixes: signed integer overflow: 65280 * 196032 cannot be represented in type 'int'
Fixes: 7279/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_G2M_fuzzer-5977332473921536
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/g2meet.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/libavcodec/g2meet.c b/libavcodec/g2meet.c index b409dae813..5edfb31560 100644 --- a/libavcodec/g2meet.c +++ b/libavcodec/g2meet.c @@ -1356,14 +1356,16 @@ static void g2m_paint_cursor(G2MContext *c, uint8_t *dst, int stride) } else { dst += x * 3; } - if (y < 0) { + + if (y < 0) h += y; + if (w < 0 || h < 0) + return; + if (y < 0) { cursor += -y * c->cursor_stride; } else { dst += y * stride; } - if (w < 0 || h < 0) - return; for (j = 0; j < h; j++) { for (i = 0; i < w; i++) { |