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avcodec/mss2: Check for repeat overflow 

Fixes: mss2_left_shift.wmv

Found-by: Piotr Bandurski <ami_stuff@o2.pl>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit e273dade78)

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2016-01-10 12:19:48 +01:00
parent 2316c35865
commit 8c08247990
1 changed files with 6 additions and 1 deletions
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7
libavcodec/mss2.c
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@ -210,8 +210,13 @@ static int decode_555(GetByteContext *gB, uint16_t *dst, int stride,
last_symbol = b << 8 | bytestream2_get_byte(gB);
else if (b > 129) {
repeat = 0;
while (b-- > 130)
while (b-- > 130) {
if (repeat >= (INT_MAX >> 8) - 1) {
av_log(NULL, AV_LOG_ERROR, "repeat overflow\n");
return AVERROR_INVALIDDATA;
}
repeat = (repeat << 8) + bytestream2_get_byte(gB) + 1;
}
if (last_symbol == -2) {
int skip = FFMIN((unsigned)repeat, dst + w - p);
repeat -= skip;