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kmvc: Check palsize. 

Fixes: CVE-2011-3952

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Based on fix by Michael Niedermayer
This commit is contained in:
Alex Converse 2012-01-26 17:30:49 +01:00
parent c898431ca5
commit 386741f887
1 changed files with 6 additions and 1 deletions
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7
libavcodec/kmvc.c
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@ -33,6 +33,7 @@
#define KMVC_KEYFRAME 0x80
#define KMVC_PALETTE 0x40
#define KMVC_METHOD 0x0F
#define MAX_PALSIZE 256
/*
* Decoder context
@ -43,7 +44,7 @@ typedef struct KmvcContext {
int setpal;
int palsize;
uint32_t pal[256];
uint32_t pal[MAX_PALSIZE];
uint8_t *cur, *prev;
uint8_t *frm0, *frm1;
GetByteContext g;
@ -380,6 +381,10 @@ static av_cold int decode_init(AVCodecContext * avctx)
c->palsize = 127;
} else {
c->palsize = AV_RL16(avctx->extradata + 10);
if (c->palsize >= MAX_PALSIZE) {
av_log(avctx, AV_LOG_ERROR, "KMVC palette too large\n");
return AVERROR_INVALIDDATA;
}
}
if (avctx->extradata_size == 1036) { // palette in extradata