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authorAkinobu Mita <akinobu.mita@gmail.com>2007-05-06 14:50:18 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-07 12:12:57 -0700
commit5bc98594d59672303c4c9c07262ecc373dc374da (patch)
treebc9855b1448222819d75fb23e26fdcd09382e460
parentcfce66047f1893cb7d3abb0d53e65cbbd8d605f0 (diff)
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. 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>
-rw-r--r--fs/hugetlbfs/inode.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index 842a4ed4052d..98959b87cdf8 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -747,6 +747,9 @@ struct file *hugetlb_zero_setup(size_t size)
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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