From 5bb01cb997d18fc9ad89086cb43f185794fcf1eb Mon Sep 17 00:00:00 2001
From: armelvil <103518994+armelvil@users.noreply.github.com>
Date: Thu, 20 Aug 2026 14:03:21 -0400
Subject: [PATCH] from_lavc_vid_conv: guard NULL conversion in
 get_av_to_uv_conversion

get_av_to_uv_conversion_int() can return a valid struct with
conversion == NULL (direct pixfmt map, decoder, or CUDA early-return
paths), but since ecd4c53bf the VERBOSE message unconditionally
dereferences ret->conversion->uv_codec, SEGV when -t file: decodes to a
directly-mapped format.

Regression introduced in ecd4c53bf.
---
 src/libavcodec/from_lavc_vid_conv.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/libavcodec/from_lavc_vid_conv.c b/src/libavcodec/from_lavc_vid_conv.c
index fd7218636..e2b988c59 100644
--- a/src/libavcodec/from_lavc_vid_conv.c
+++ b/src/libavcodec/from_lavc_vid_conv.c
@@ -2353,7 +2353,8 @@ get_av_to_uv_conversion(int av_codec, codec_t uv_codec)
         if (ret == NULL) {
                 return NULL;
         }
-        if (ret->dst_pixfmt == ret->conversion->uv_codec) {
+        if (ret->conversion == NULL ||
+            ret->dst_pixfmt == ret->conversion->uv_codec) {
                 MSG(VERBOSE, "converting %s to %s\n",
                     av_get_pix_fmt_name(av_codec),
                     get_codec_name(ret->dst_pixfmt));