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avcodec/iff: Fix several integer overflows

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Fixes: negation of -2147483648 cannot be represented in type 'int32_t' (aka 'int'); cast to an unsigned type to negate this value to itself
Fixes: signed integer overflow: -2147483648 - 1 cannot be represented in type 'int32_t' (aka 'int')
Fixes: 20492/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_IFF_ILBM_fuzzer-5764066459254784

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 7a92147f87129851c1cc2c15f4ba714b8cf23f71)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-05-10 12:04:05 +02:00
parent 07388eee45
commit ed96d96303
1 changed files with 1 additions and 2 deletions
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3
libavcodec/iff.c
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@ -1375,11 +1375,10 @@ static void decode_delta_d(uint8_t *dst,
opcode--;
}
} else {
opcode = -opcode;
while (opcode && bytestream2_get_bytes_left(&gb) > 0) {
bytestream2_put_be32(&pb, bytestream2_get_be32(&gb));
bytestream2_skip_p(&pb, pitch - 4);
opcode--;
opcode++;
}
}
entries--;