[PATCH] hugetlbfs: add NULL check in hugetlb_zero_setup()

From: Akinobu Mita
Date: Sat Apr 28 2007 - 12:36:11 EST

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@xxxxxxxxxxxxxx>
Signed-off-by: Akinobu Mita <akinobu.mita@xxxxxxxxx>

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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