Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Mon, 13 May 2019 22:18:31 +0800
From:   Gen Zhang <blackgod016574@gmail.com>
To:     cl@linux.com, penberg@kernel.org
Cc:     linux-kernel@vger.kernel.org
Subject: [Patch] slub: Fix a missing-check bug in mm/slub.c file of Linux
 5.1.1
Message-ID: <20190513141831.GA9502@zhanggen-UX430UQ>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
User-Agent: Mutt/1.5.24 (2015-08-30)
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Pointer s is allocated with kmem_cache_zalloc(). And s is used in the 
follwoing codes. However, when kmem_cache_zalloc fails, using s will
cause null pointer dereference and the kernel will go wrong. Thus we 
check whether the kmem_cache_zalloc fails.

Signed-off-by: Gen Zhang <blackgod016574@gmail.com>

---
--- mm/slub.c
+++ mm/slub.c
@@ -4201,6 +4201,8 @@ static struct kmem_cache * __init bootst
 {
 	int node;
 	struct kmem_cache *s = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT);
+	if (!s)
+		return ERR_PTR(-ENOMEM);
 	struct kmem_cache_node *n;
 
 	memcpy(s, static_cache, kmem_cache->object_size);
---