From dd875f56b7fe0f04cf7c1c40faee5f7bad9db021 Mon Sep 17 00:00:00 2001
From: Manuel Lauss <manuel.lauss@gmail.com>
Date: Tue, 2 Sep 2025 17:25:17 +0200
Subject: [PATCH] avcodec/sanm: invalidate STOR data when subversion changes

since the STOR data is a different format.

Signed-off-by: Manuel Lauss <manuel.lauss@gmail.com>
---
 libavcodec/sanm.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/libavcodec/sanm.c b/libavcodec/sanm.c
index d1d53aa2da..5bb8f9017e 100644
--- a/libavcodec/sanm.c
+++ b/libavcodec/sanm.c
@@ -1795,8 +1795,10 @@ static int process_frame_obj(SANMVideoContext *ctx, GetByteContext *gb,
     }
 
     /* users of codecs>=37 are subversion 2, enforce that for STOR/FTCH */
-    if (fsc)
+    if (fsc && ctx->subversion < 2) {
         ctx->subversion = 2;
+        ctx->stor_size = 0;  /* invalidate existing data */
+    }
 
     /* clear the main buffer on the first fob */
     if (ctx->first_fob) {