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Subject[PATCH] hugetlbfs: make BUG_ON(!inode) takes effect in hugetlbfs_setattr
Date
When we reach here with inode = NULL, we should have crashed as inode has
already been dereferenced via hstate_inode. In order to make BUG_ON(!inode)
takes effect, we should defer initializing hstate until we really need it.
Also do this for hugetlbfs_inode_info as it's only used when ia_valid is
verified with ATTR_SIZE.

Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
---
fs/hugetlbfs/inode.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index 740693d7f255..9b221b87fbea 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -755,10 +755,8 @@ static long hugetlbfs_fallocate(struct file *file, int mode, loff_t offset,
static int hugetlbfs_setattr(struct dentry *dentry, struct iattr *attr)
{
struct inode *inode = d_inode(dentry);
- struct hstate *h = hstate_inode(inode);
int error;
unsigned int ia_valid = attr->ia_valid;
- struct hugetlbfs_inode_info *info = HUGETLBFS_I(inode);

BUG_ON(!inode);

@@ -767,6 +765,8 @@ static int hugetlbfs_setattr(struct dentry *dentry, struct iattr *attr)
return error;

if (ia_valid & ATTR_SIZE) {
+ struct hstate *h = hstate_inode(inode);
+ struct hugetlbfs_inode_info *info = HUGETLBFS_I(inode);
loff_t oldsize = inode->i_size;
loff_t newsize = attr->ia_size;

--
2.19.1
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