avutil/file: add more check befor destory the buffer

add more check befor destory the buffer

Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Jun Zhao <barryjzhao@tencent.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/libavutil/file.c b/libavutil/file.c
index b91c2fa391..f228b723ec 100644
--- a/libavutil/file.c
+++ b/libavutil/file.c
@@ -143,7 +143,7 @@ out:
 
 void av_file_unmap(uint8_t *bufptr, size_t size)
 {
-    if (!size)
+    if (!size || !bufptr)
         return;
 #if HAVE_MMAP
     munmap(bufptr, size);