From 85138c1ec673e05263ae666baf61f79384daf7e0 Mon Sep 17 00:00:00 2001

From: Sam Lantinga <slouken@libsdl.org>

Date: Tue, 30 Jul 2019 11:00:00 -0700

Subject: Fixed bug 4538 - validate image size when loading BMP files

diff --git a/src/video/SDL_bmp.c b/src/video/SDL_bmp.c

index 0b68918cc..a06b0c94c 100644

--- a/src/video/SDL_bmp.c

+++ b/src/video/SDL_bmp.c

@@ -226,6 +226,11 @@ SDL_LoadBMP_RW(SDL_RWops * src, int freesrc)

             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;