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hugetlbfs: add NULL check in hugetlb_zero_setup()

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

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Acked-by: William Irwin <wli@holomorphy.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Akinobu Mita 2007-05-06 14:50:18 -07:00 committed by Linus Torvalds
parent cfce66047f
commit 5bc98594d5
1 changed files with 3 additions and 0 deletions

3
fs/hugetlbfs/inode.c
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@ -747,6 +747,9 @@ struct file *hugetlb_zero_setup(size_t size)
char buf[16]; char buf[16];
static atomic_t counter; static atomic_t counter;
if (!hugetlbfs_vfsmount)
return ERR_PTR(-ENOENT);
if (!can_do_hugetlb_shm()) if (!can_do_hugetlb_shm())
return ERR_PTR(-EPERM); return ERR_PTR(-EPERM);