linux-kernel - [PATCH] hugetlbfs: add NULL check in hugetlb_zero

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Date:	Sun, 29 Apr 2007 01:29:48 +0900
From:	Akinobu Mita <akinobu.mita@...il.com>
To:	William Lee Irwin III <wli@...omorphy.com>,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
Subject: [PATCH] hugetlbfs: add NULL check in hugetlb_zero_setup()

If hugetlbfs module_init() fails, hugetlbfs_vfsmount
is not initialized and shmget() with SHM_HUGETLB flag will
cause NULL pointer dereference.

Cc: William Irwin <wli@...omorphy.com>
Signed-off-by: Akinobu Mita <akinobu.mita@...il.com>

Index: 2.6-mm/fs/hugetlbfs/inode.c
===================================================================
--- 2.6-mm.orig/fs/hugetlbfs/inode.c
+++ 2.6-mm/fs/hugetlbfs/inode.c
@@ -740,6 +740,9 @@ struct file *hugetlb_zero_setup(size_t s
 	char buf[16];
 	static atomic_t counter;
 
+	if (!hugetlbfs_vfsmount)
+		return ERR_PTR(-ENOENT);
+
 	if (!can_do_hugetlb_shm())
 		return ERR_PTR(-EPERM);
 
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