SDL: metal: check MTLBuffer allocations for nil before using their contents.

SDL Commits
1 
From e1b3c8afd574e9da9638103646792d75bfee7394 Mon Sep 17 00:00:00 2001
From: Jacul <[EMAIL REDACTED]>
Date: Sun, 5 Jul 2026 22:52:41 -0400
Subject: [PATCH] metal: check MTLBuffer allocations for nil before using their
 contents.

---
 src/render/metal/SDL_render_metal.m | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/render/metal/SDL_render_metal.m b/src/render/metal/SDL_render_metal.m
index 0b2ddf710dda9..f718fcc9f811a 100644
--- a/src/render/metal/SDL_render_metal.m
+++ b/src/render/metal/SDL_render_metal.m
@@ -1606,6 +1606,9 @@ static bool SetDrawState(SDL_Renderer *renderer, const SDL_RenderCommand *cmd, c
     if (statecache->shader_constants_dirty ||
         SDL_memcmp(shader_constants, &statecache->shader_constants, sizeof(*shader_constants)) != 0) {
         id<MTLBuffer> mtlbufconstants = [data.mtldevice newBufferWithLength:sizeof(*shader_constants) options:MTLResourceStorageModeShared];
+        if (mtlbufconstants == nil) {
+            return SDL_OutOfMemory();
+        }
         mtlbufconstants.label = @"SDL shader constants data";
         SDL_memcpy([mtlbufconstants contents], shader_constants, sizeof(*shader_constants));
         [data.mtlcmdencoder setFragmentBuffer:mtlbufconstants offset:0 atIndex:0];
@@ -1776,6 +1779,9 @@ static bool METAL_RunCommandQueue(SDL_Renderer *renderer, SDL_RenderCommand *cmd
              * practices guide recommends this approach for streamed vertex data.
              */
             mtlbufvertex = [data.mtldevice newBufferWithLength:vertsize options:MTLResourceStorageModeShared];
+            if (mtlbufvertex == nil) {
+                return SDL_OutOfMemory();
+            }
             mtlbufvertex.label = @"SDL vertex data";
             SDL_memcpy([mtlbufvertex contents], vertices, vertsize);