From c634da718db9b2fac201df2ae1b1b095344ce5eb Mon Sep 17 00:00:00 2001 From: Miklos Szeredi Date: Tue, 12 Nov 2019 11:49:04 +0100 Subject: fuse: verify nlink When adding a new hard link, make sure that i_nlink doesn't overflow. Fixes: ac45d61357e8 ("fuse: fix nlink after unlink") Cc: # v3.4 Signed-off-by: Miklos Szeredi --- fs/fuse/dir.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'fs/fuse') diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c index ca4ddbe21ec0..ee190119f45c 100644 --- a/fs/fuse/dir.c +++ b/fs/fuse/dir.c @@ -870,7 +870,8 @@ static int fuse_link(struct dentry *entry, struct inode *newdir, spin_lock(&fi->lock); fi->attr_version = atomic64_inc_return(&fc->attr_version); - inc_nlink(inode); + if (likely(inode->i_nlink < UINT_MAX)) + inc_nlink(inode); spin_unlock(&fi->lock); fuse_invalidate_attr(inode); fuse_update_ctime(inode); -- cgit v1.2.3