From b6697fbdca1c6c5293bfc7132b7dc2de98d3bf4e Mon Sep 17 00:00:00 2001
From: ASTRA <astramentor2k20@gmail.com>
Date: Thu, 23 Apr 2026 22:26:30 +0200
Subject: [PATCH] avformat/wavdec: Fix use-of-uninitialized-value in
 find_guid()

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 163ba704b7f579350d7765951c87882a8a20c54c)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavformat/wavdec.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libavformat/wavdec.c b/libavformat/wavdec.c
index 37a214b27e..e5374675cd 100644
--- a/libavformat/wavdec.c
+++ b/libavformat/wavdec.c
@@ -680,7 +680,8 @@ static int64_t find_guid(AVIOContext *pb, const uint8_t guid1[16])
     int64_t size;
 
     while (!avio_feof(pb)) {
-        avio_read(pb, guid, 16);
+        if (avio_read(pb, guid, 16) != 16)
+            break;
         size = avio_rl64(pb);
         if (size <= 24 || size > INT64_MAX - 8)
             return AVERROR_INVALIDDATA;