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avcodec/get_bits: Make sure the input bitstream with padding can be addressed 

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2018-03-24 01:38:53 +01:00
parent 78f8036c9c
commit e529fe7633
1 changed files with 2 additions and 1 deletions
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3
libavcodec/get_bits.h
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@ -32,6 +32,7 @@
#include "libavutil/intreadwrite.h"
#include "libavutil/log.h"
#include "libavutil/avassert.h"
#include "avcodec.h"
#include "mathops.h"
#include "vlc.h"
@ -428,7 +429,7 @@ static inline int init_get_bits(GetBitContext *s, const uint8_t *buffer,
int buffer_size;
int ret = 0;
if (bit_size >= INT_MAX - 7 || bit_size < 0 || !buffer) {
if (bit_size >= INT_MAX - FFMAX(7, AV_INPUT_BUFFER_PADDING_SIZE*8) || bit_size < 0 || !buffer) {
bit_size = 0;
buffer = NULL;
ret = AVERROR_INVALIDDATA;