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avformat/nsvdec: Do not parse multiple NSVf 

The specification states "NSV files may contain a single file header. "
Fixes: out of array access
Fixes: nsv-asan-002f473f726a0dcbd3bd53e422c4fc40b3cf3421

Found-by: Paul Ch <paulcher@icloud.com>
Tested-by: Paul Ch <paulcher@icloud.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2018-08-16 12:23:20 +02:00
parent 77429b4217
commit 78d4b6bd43
1 changed files with 7 additions and 0 deletions
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7
libavformat/nsvdec.c
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@ -176,6 +176,7 @@ typedef struct NSVContext {
int16_t avsync;
AVRational framerate;
uint32_t *nsvs_timestamps;
int nsvf;
} NSVContext;
static const AVCodecTag nsv_codec_video_tags[] = {
@ -266,6 +267,12 @@ static int nsv_parse_NSVf_header(AVFormatContext *s)
nsv->state = NSV_UNSYNC; /* in case we fail */
if (nsv->nsvf) {
av_log(s, AV_LOG_TRACE, "Multiple NSVf\n");
return 0;
}
nsv->nsvf = 1;
size = avio_rl32(pb);
if (size < 28)
return -1;