diff -r f1baffa48926 -r ba45f00879ba IMG_bmp.c
--- a/IMG_bmp.c	Tue Jul 30 10:16:02 2019 -0700
+++ b/IMG_bmp.c	Tue Jul 30 11:00:12 2019 -0700
@@ -351,6 +351,11 @@
             SDL_RWseek(src, (biSize - headerSize), RW_SEEK_CUR);
         }
     }
+    if (biWidth <= 0 || biHeight == 0) {
+        IMG_SetError("BMP file with bad dimensions (%dx%d)", biWidth, biHeight);
+        was_error = SDL_TRUE;
+        goto done;
+    }
     if (biHeight < 0) {
         topDown = SDL_TRUE;
         biHeight = -biHeight;