ffmpeg: fix CVE-2024-31578

FFmpeg version n6.1.1 was discovered to contain a heap use-after-free via the av_hwframe_ctx_init function.

(From OE-Core rev: bd9fe64c40f7f4e1d18b5d33a9a366e95c2ddd2d)

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

meta/recipes-multimedia/ffmpeg/ffmpeg/CVE-2024-31578.patch

@@ -0,0 +1,49 @@
+From edeeb35cecb5bc0d433b14dd0e544ae826b7ece5 Mon Sep 17 00:00:00 2001
+From: Zhao Zhili <zhilizhao@tencent.com>
+Date: Tue, 20 Feb 2024 20:08:55 +0800
+Subject: [PATCH] avutil/hwcontext: Don't assume frames_uninit is reentrant
+
+Fix heap use after free when vulkan_frames_init failed.
+
+Signed-off-by: Zhao Zhili <zhilizhao@tencent.com>
+
+CVE: CVE-2024-31578
+
+Upstream-Status: Backport [https://github.com/ffmpeg/ffmpeg/commit/3bb00c0a420c3ce83]
+
+Signed-off-by: Archana Polampalli <archana.polampalli@windriver.com>
+---
+ libavutil/hwcontext.c | 8 ++------
+ 1 file changed, 2 insertions(+), 6 deletions(-)
+
+diff --git a/libavutil/hwcontext.c b/libavutil/hwcontext.c
+index 3650d46..0ef3479 100644
+--- a/libavutil/hwcontext.c
++++ b/libavutil/hwcontext.c
+@@ -363,7 +363,7 @@ int av_hwframe_ctx_init(AVBufferRef *ref)
+     if (ctx->internal->hw_type->frames_init) {
+         ret = ctx->internal->hw_type->frames_init(ctx);
+         if (ret < 0)
+-            goto fail;
++            return ret;
+     }
+
+     if (ctx->internal->pool_internal && !ctx->pool)
+@@ -373,14 +373,10 @@ int av_hwframe_ctx_init(AVBufferRef *ref)
+     if (ctx->initial_pool_size > 0) {
+         ret = hwframe_pool_prealloc(ref);
+         if (ret < 0)
+-            goto fail;
++            return ret;
+     }
+
+     return 0;
+-fail:
+-    if (ctx->internal->hw_type->frames_uninit)
+-        ctx->internal->hw_type->frames_uninit(ctx);
+-    return ret;
+ }
+
+ int av_hwframe_transfer_get_formats(AVBufferRef *hwframe_ref,
+--
+2.40.0

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

@@ -28,6 +28,7 @@ SRC_URI = " \
     file://vulkan_av1_stable_API.patch \
     file://vulkan_fix_gcc14.patch \
     file://CVE-2023-49502.patch \
+    file://CVE-2024-31578.patch \
 "
 
 SRC_URI[sha256sum] = "8684f4b00f94b85461884c3719382f1261f0d9eb3d59640a1f4ac0873616f968"