File ffmpeg-CVE-2025-22921.patch of Package ffmpeg.39181

commit 7f9c7f9849a2155224711f0ff57ecdac6e4bfb57 (20250111_CVE-2025-22921_7f9c7f9849a2155224711f0ff57ecdac6e4bfb57_null_bsc#1237382)
Author: James Almer <jamrial@gmail.com>
Date:   Wed Jan 1 23:58:39 2025 -0300

    avcodec/jpeg2000dec: clear array length when freeing it
    
    Fixes NULL pointer dereferences.
    Fixes ticket #11393.
    
    Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
    Signed-off-by: James Almer <jamrial@gmail.com>

--- a/libavcodec/jpeg2000dec.c
+++ b/libavcodec/jpeg2000dec.c
@@ -1051,6 +1051,7 @@
                 }
             }
         }
+	cblk->nb_lengthinc = 0;
     }
     return 0;
 }