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avcodec/rangecoder: Check e

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Fixes hang.nut

Found-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit b2955b6c5aed11026ec5c7164462899a10cdb937)

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2015-09-25 14:26:14 +02:00
parent abd20c2057
commit 50f62fef19
2 changed files with 6 additions and 1 deletions
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5
libavcodec/ffv1dec.c
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@ -47,8 +47,11 @@ static inline av_flatten int get_symbol_inline(RangeCoder *c, uint8_t *state,
else { else {
int i, e, a; int i, e, a;
e = 0; e = 0;
while (get_rac(c, state + 1 + FFMIN(e, 9))) // 1..10 while (get_rac(c, state + 1 + FFMIN(e, 9))) { // 1..10
e++; e++;
if (e > 31)
return AVERROR_INVALIDDATA;
}
a = 1; a = 1;
for (i = e - 1; i >= 0; i--) for (i = e - 1; i >= 0; i--)

2
libavcodec/snow.h
View File

@ -563,6 +563,8 @@ static inline int get_symbol(RangeCoder *c, uint8_t *state, int is_signed){
e= 0; e= 0;
while(get_rac(c, state+1 + FFMIN(e,9))){ //1..10 while(get_rac(c, state+1 + FFMIN(e,9))){ //1..10
e++; e++;
if (e > 31)
return AVERROR_INVALIDDATA;
} }
a= 1; a= 1;