From 7df1cb3dce1e8cac2021b6773d9ab8ed511cd7ce Mon Sep 17 00:00:00 2001
From: James Almer <jamrial@gmail.com>
Date: Sun, 22 Sep 2019 23:55:49 -0300
Subject: [PATCH] avcodec/bsf: check that AVBSFInternal was allocated before
 dereferencing it

This can happen when av_bsf_free() is called on av_bsf_alloc() failure.

Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: James Almer <jamrial@gmail.com>
(cherry picked from commit d889ae33962e4ad2b24175418fe89d72ce712179)
---
 libavcodec/bsf.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libavcodec/bsf.c b/libavcodec/bsf.c
index ac2024b8db..bfcf4af4d0 100644
--- a/libavcodec/bsf.c
+++ b/libavcodec/bsf.c
@@ -48,7 +48,8 @@ void av_bsf_free(AVBSFContext **pctx)
 
     av_opt_free(ctx);
 
-    av_packet_free(&ctx->internal->buffer_pkt);
+    if (ctx->internal)
+        av_packet_free(&ctx->internal->buffer_pkt);
     av_freep(&ctx->internal);
     av_freep(&ctx->priv_data);