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

[Akinobu Mita]

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);
 
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/