https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5707

diff --git a/coders/wbmp.c b/coders/wbmp.c
index abbb5f4d7a2f7685a2a507d420ff724bca4c7f30..66232acdf69a168665acb14a184fad078012cabd 100644 (file)
--- a/coders/wbmp.c
+++ b/coders/wbmp.c
@@ -159,6 +159,7 @@ static Image *ReadWBMPImage(const ImageInfo *image_info,
       image=DestroyImageList(image);
       return((Image *) NULL);
     }
+  header=0;
   if (ReadBlob(image,2,(unsigned char *) &header) == 0)
     ThrowReaderException(CorruptImageError,"ImproperImageHeader");
   if (header != 0)