From e12c931e5bb260821ac7f11833eb627331779dcf Mon Sep 17 00:00:00 2001
From: Ozkan Sezer <sezeroz@gmail.com>
Date: Tue, 30 Jul 2019 21:29:15 +0300
Subject: [PATCH] Fixed bug 4538 - validate image size when loading BMP files

---
 IMG_bmp.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/IMG_bmp.c b/IMG_bmp.c
index bb2517b8..9e3ab889 100644
--- a/IMG_bmp.c
+++ b/IMG_bmp.c
@@ -272,6 +272,11 @@ static SDL_Surface *LoadBMP_RW (SDL_RWops *src, int freesrc)
 		biClrUsed	= SDL_ReadLE32(src);
 		biClrImportant	= SDL_ReadLE32(src);
 	}
+	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;