Eliminate invalid write in PNM coder

Credit OSS Fuzz

diff --git a/coders/pnm.c b/coders/pnm.c
index 7e2e45c74a085dac8c8501c320e8751944c440b8..8184730f0af393beeeff4135cfe53faa53c11f57 100644 (file)
--- a/coders/pnm.c
+++ b/coders/pnm.c
@@ -1131,6 +1131,7 @@ static Image *ReadPNMImage(const ImageInfo *image_info,ExceptionInfo *exception)
                           }
                         q+=GetPixelChannels(image);
                       }
+                      break;
                     }
                   for (x=0; x < (ssize_t) image->columns; x++)
                   {