ffmpeg: fix CVE-2025-25471

FFmpeg git master before commit fd1772 was discovered to contain a NULL pointer
dereference via the component libavformat/mov.c.

(From OE-Core rev: a8331b11d5d7aa8f1997eaa189b74aaab7cc44da)

Signed-off-by: Archana Polampalli <archana.polampalli@windriver.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>

meta/recipes-multimedia/ffmpeg/ffmpeg/CVE-2025-25471.patch

@@ -0,0 +1,39 @@
+From 1446e37d3d032e1452844778b3e6ba2c20f0c322 Mon Sep 17 00:00:00 2001
+From: James Almer <jamrial@gmail.com>
+Date: Mon, 30 Dec 2024 00:25:41 -0300
+Subject: [PATCH] avfilter/buffersrc: check for valid sample rate
+
+A sample rate <= 0 is invalid.
+
+Fixes an assert in ffmpeg_enc.c that assumed a valid sample rate would be set.
+Fixes ticket #11385.
+
+Signed-off-by: James Almer <jamrial@gmail.com>
+
+CVE: CVE-2025-25471
+
+Upstream-Status: Backport [https://git.ffmpeg.org/gitweb/ffmpeg.git/commit/1446e37d3d032e1452844778b3e6ba2c20f0c322]
+
+Signed-off-by: Archana Polampalli <archana.polampalli@windriver.com>
+---
+ libavfilter/buffersrc.c | 5 +++++
+ 1 file changed, 5 insertions(+)
+
+diff --git a/libavfilter/buffersrc.c b/libavfilter/buffersrc.c
+index 453fc0f..f49aa91 100644
+--- a/libavfilter/buffersrc.c
++++ b/libavfilter/buffersrc.c
+@@ -401,6 +401,11 @@ FF_ENABLE_DEPRECATION_WARNINGS
+         av_channel_layout_describe(&s->ch_layout, buf, sizeof(buf));
+     }
+
++    if (s->sample_rate <= 0) {
++        av_log(ctx, AV_LOG_ERROR, "Sample rate not set\n");
++        return AVERROR(EINVAL);
++    }
++
+     if (!s->time_base.num)
+         s->time_base = (AVRational){1, s->sample_rate};
+
+--
+2.40.0

meta/recipes-multimedia/ffmpeg/ffmpeg_6.1.1.bb

@@ -48,6 +48,7 @@ SRC_URI = " \
     file://CVE-2024-36619.patch \
     file://CVE-2024-35369.patch \
     file://CVE-2025-25473.patch \
+    file://CVE-2025-25471.patch \
 "
 
 SRC_URI[sha256sum] = "8684f4b00f94b85461884c3719382f1261f0d9eb3d59640a1f4ac0873616f968"