From a7e506fcd8442ee432ae1450ccc4ce212b5c2e1e Mon Sep 17 00:00:00 2001
From: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
Date: Fri, 17 May 2024 22:14:56 +0200
Subject: [PATCH] avcodec/vc1_parser: Check init_get_bits8()

Addresses Coverity issue #1441935.

Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
---
 libavcodec/vc1_parser.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/libavcodec/vc1_parser.c b/libavcodec/vc1_parser.c
index ec284dca00..a536a7bcf8 100644
--- a/libavcodec/vc1_parser.c
+++ b/libavcodec/vc1_parser.c
@@ -26,6 +26,7 @@
  */
 
 #include "libavutil/attributes.h"
+#include "libavutil/avassert.h"
 #include "parser.h"
 #include "vc1.h"
 #include "get_bits.h"
@@ -66,7 +67,9 @@ static void vc1_extract_header(AVCodecParserContext *s, AVCodecContext *avctx,
     GetBitContext gb;
     int ret;
     vpc->v.s.avctx = avctx;
-    init_get_bits8(&gb, buf, buf_size);
+    ret = init_get_bits8(&gb, buf, buf_size);
+    av_assert1(ret >= 0); // buf_size is bounded by UNESCAPED_THRESHOLD
+
     switch (vpc->prev_start_code) {
     case VC1_CODE_SEQHDR & 0xFF:
         ff_vc1_decode_sequence_header(avctx, &vpc->v, &gb);