linux-kernel - [Patch] slub: Fix a missing-check bug in mm/slub.c file of Linux 5.1.1

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Message-ID: <20190515064457.GA29939@zhanggen-UX430UQ>
Date:   Wed, 15 May 2019 14:44:57 +0800
From:   Gen Zhang <blackgod016574@...il.com>
To:     rientjes@...gle.com, iamjoonsoo.kim@....com
Cc:     linux-kernel@...r.kernel.org
Subject: [Patch] slub: Fix a missing-check bug in mm/slub.c file of Linux
 5.1.1

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@...il.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);
---