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avformat/evcdec: ensure there are enough bytes to seekback 

Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
James Almer 2023-06-19 23:25:43 -03:00
parent 83b3ff741b
commit 2276bcc52a
1 changed files with 6 additions and 1 deletions
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7
libavformat/evcdec.c
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@ -30,6 +30,7 @@
#include "rawdec.h"
#include "avformat.h"
#include "avio_internal.h"
#include "internal.h"
@ -192,8 +193,12 @@ static int evc_read_packet(AVFormatContext *s, AVPacket *pkt)
}
while(!au_end_found) {
uint8_t buf[EVC_NALU_LENGTH_PREFIX_SIZE];
ret = ffio_ensure_seekback(s->pb, EVC_NALU_LENGTH_PREFIX_SIZE);
if (ret < 0)
return ret;
ret = avio_read(s->pb, (unsigned char *)&buf, EVC_NALU_LENGTH_PREFIX_SIZE);
if (ret < 0) {
av_packet_unref(pkt);