diff -r b810b78d32cc -r e7ba650a643a src/video/SDL_bmp.c
--- a/src/video/SDL_bmp.c	Thu Jul 25 08:05:13 2019 -0500
+++ b/src/video/SDL_bmp.c	Tue Jul 30 11:00:00 2019 -0700
@@ -226,6 +226,11 @@
             SDL_RWseek(src, (biSize - headerSize), RW_SEEK_CUR);
         }
     }
+    if (biWidth <= 0 || biHeight == 0) {
+        SDL_SetError("BMP file with bad dimensions (%dx%d)", biWidth, biHeight);
+        was_error = SDL_TRUE;
+        goto done;
+    }
     if (biHeight < 0) {
         topDown = SDL_TRUE;
         biHeight = -biHeight;