https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5373

diff --git a/coders/txt.c b/coders/txt.c
index 5b0f155ec4841997fff404301d3d425f8ec64091..80cdf7af854a048ac6c8843f7b2904a77469f19e 100644 (file)
--- a/coders/txt.c
+++ b/coders/txt.c
@@ -437,6 +437,8 @@ static Image *ReadTXTImage(const ImageInfo *image_info,ExceptionInfo *exception)
   (void) ReadBlobString(image,text);
   if (LocaleNCompare((char *) text,MagickID,strlen(MagickID)) != 0)
     ThrowReaderException(CorruptImageError,"ImproperImageHeader");
+  x_offset=(-1);
+  y_offset=(-1);
   do
   {
     width=0;