From 97fefd050976bbbfca9608499f6a7d9fb86e70db Mon Sep 17 00:00:00 2001
From: Sam Lantinga <slouken@libsdl.org>
Date: Tue, 30 Jul 2019 11:00:00 -0700
Subject: [PATCH] Fixed bug 4538 - validate image size when loading BMP files
---
 src/video/SDL_bmp.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/video/SDL_bmp.c b/src/video/SDL_bmp.c
index 8eadc5f..5b5e12c 100644
--- a/src/video/SDL_bmp.c
+++ b/src/video/SDL_bmp.c
@@ -143,6 +143,11 @@ SDL_Surface * SDL_LoadBMP_RW (SDL_RWops *src, int freesrc)
 	(void) biYPelsPerMeter;
 	(void) biClrImportant;
 
+        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;
-- 
2.25.1