From cd03e0a001f301b5c584491a53fe991e8d87ffb2 Mon Sep 17 00:00:00 2001
From: James Almer <jamrial@gmail.com>
Date: Thu, 8 Jan 2026 21:50:38 -0300
Subject: [PATCH] libavformat/evcdec.c: add a check to ensure
 evc_frame_merge_bsf is present

While the inclusion of the bsf is forced by a configure check, it's better to not
just have the code here assume filter will never be NULL.

Fixes Coverity issue CID 1680305.

Signed-off-by: James Almer <jamrial@gmail.com>
---
 libavformat/evcdec.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libavformat/evcdec.c b/libavformat/evcdec.c
index 9e735fab55..7ba9fdca54 100644
--- a/libavformat/evcdec.c
+++ b/libavformat/evcdec.c
@@ -104,6 +104,9 @@ static int evc_read_header(AVFormatContext *s)
     EVCDemuxContext *c = s->priv_data;
     int ret = 0;
 
+    if (!filter)
+        return AVERROR_BUG;
+
     st = avformat_new_stream(s, NULL);
     if (!st) {
         ret = AVERROR(ENOMEM);