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avcodec/iff: ensure that runs with insufficient input dont leave uninitialized bytes in the output

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Fixes use of uninitialized memory
Fixes: msan_uninit-mem_7fa0dea15eae_8988_test.iff
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-01-02 14:50:48 +01:00
parent 7340718d1c
commit 4843227b2c
1 changed files with 4 additions and 4 deletions
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8
libavcodec/iff.c
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@ -488,12 +488,12 @@ static int decode_byterun(uint8_t *dst, int dst_size,
unsigned length;
const int8_t value = *buf++;
if (value >= 0) {
length = value + 1;
memcpy(dst + x, buf, FFMIN3(length, dst_size - x, buf_end - buf));
length = FFMIN3(value + 1, dst_size - x, buf_end - buf);
memcpy(dst + x, buf, length);
buf += length;
} else if (value > -128) {
length = -value + 1;
memset(dst + x, *buf++, FFMIN(length, dst_size - x));
length = FFMIN(-value + 1, dst_size - x);
memset(dst + x, *buf++, length);
} else { // noop
continue;
}