From 5c146d2b6504d01eb4e502f1a50c21043a9736d4 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <slouken@libsdl.org>
Date: Tue, 30 Jul 2019 11:00:12 -0700
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 dc54f8ab..8ace1272 100644
--- a/IMG_bmp.c
+++ b/IMG_bmp.c
@@ -351,6 +351,11 @@ static SDL_Surface *LoadBMP_RW (SDL_RWops *src, int freesrc)
             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;