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>

diff --git a/libavcodec/bsf.c b/libavcodec/bsf.c
index 71915dea8519882b3a774b0d59839121530cad9f..c1653cddb034cdbcaf339267bde97ab0d1585546 100644 (file)
--- a/libavcodec/bsf.c
+++ b/libavcodec/bsf.c
@@ -47,7 +47,8 @@ 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);