File ffmpeg-CVE-2021-38114.patch of Package ffmpeg.21291

diff --unified --recursive --text --new-file --color ffmpeg-3.4.2.old/libavcodec/dnxhddec.c ffmpeg-3.4.2.new/libavcodec/dnxhddec.c
--- ffmpeg-3.4.2.old/libavcodec/dnxhddec.c	2021-07-07 09:18:17.122624029 +0800
+++ ffmpeg-3.4.2.new/libavcodec/dnxhddec.c	2021-08-12 10:41:49.366141376 +0800
@@ -107,6 +107,7 @@
 
 static int dnxhd_init_vlc(DNXHDContext *ctx, uint32_t cid, int bitdepth)
 {
+    int ret;
     if (cid != ctx->cid) {
         int index;
 
@@ -126,19 +127,26 @@
         ff_free_vlc(&ctx->dc_vlc);
         ff_free_vlc(&ctx->run_vlc);
 
-        init_vlc(&ctx->ac_vlc, DNXHD_VLC_BITS, 257,
+        if ((ret = init_vlc(&ctx->ac_vlc, DNXHD_VLC_BITS, 257,
                  ctx->cid_table->ac_bits, 1, 1,
-                 ctx->cid_table->ac_codes, 2, 2, 0);
-        init_vlc(&ctx->dc_vlc, DNXHD_DC_VLC_BITS, bitdepth > 8 ? 14 : 12,
+                 ctx->cid_table->ac_codes, 2, 2, 0)) < 0)
+            goto out;
+        if ((ret = init_vlc(&ctx->dc_vlc, DNXHD_DC_VLC_BITS, bitdepth > 8 ? 14 : 12,
                  ctx->cid_table->dc_bits, 1, 1,
-                 ctx->cid_table->dc_codes, 1, 1, 0);
-        init_vlc(&ctx->run_vlc, DNXHD_VLC_BITS, 62,
+                 ctx->cid_table->dc_codes, 1, 1, 0)) < 0)
+            goto out;
+        if ((ret = init_vlc(&ctx->run_vlc, DNXHD_VLC_BITS, 62,
                  ctx->cid_table->run_bits, 1, 1,
-                 ctx->cid_table->run_codes, 2, 2, 0);
+                 ctx->cid_table->run_codes, 2, 2, 0)) < 0)
+            goto out;
 
         ctx->cid = cid;
     }
-    return 0;
+    ret = 0;
+out:
+    if (ret < 0)
+        av_log(ctx->avctx, AV_LOG_ERROR, "init_vlc failed\n");
+    return ret;
 }
 
 static av_cold int dnxhd_decode_init_thread_copy(AVCodecContext *avctx)