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 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;