From 603234f945be3a508ca42b272ff76468168e510d Mon Sep 17 00:00:00 2001
From: Zhao Zhili <zhilizhao@tencent.com>
Date: Mon, 13 Apr 2026 21:16:07 +0800
Subject: [PATCH] avdevice/v4l2: fix mmap_free() skipping first buffer

Signed-off-by: Zhao Zhili <zhilizhao@tencent.com>
---
 libavdevice/v4l2.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/libavdevice/v4l2.c b/libavdevice/v4l2.c
index 28bcc3df2a..2ca093b7b0 100644
--- a/libavdevice/v4l2.c
+++ b/libavdevice/v4l2.c
@@ -362,9 +362,8 @@ static void list_standards(AVFormatContext *ctx)
 
 static void mmap_free(struct video_data *s, int n)
 {
-    while (--n > 0) {
-        v4l2_munmap(s->buf_data[n].start, s->buf_data[n].len);
-    }
+    for (int i = 0; i < n; i++)
+        v4l2_munmap(s->buf_data[i].start, s->buf_data[i].len);
     av_freep(&s->buf_data);
 }