From 9f435a5e3f5f28e20a6b6cfc2301cf5310f6238a Mon Sep 17 00:00:00 2001 From: Miklos Szeredi Date: Tue, 12 Nov 2019 11:49:04 +0100 Subject: [PATCH] fuse: verify nlink commit c634da718db9b2fac201df2ae1b1b095344ce5eb upstream. 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 Signed-off-by: Greg Kroah-Hartman --- fs/fuse/dir.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c index e7a2a988533d..1df6a6f3d8fd 100644 --- a/fs/fuse/dir.c +++ b/fs/fuse/dir.c @@ -837,7 +837,8 @@ static int fuse_link(struct dentry *entry, struct inode *newdir, spin_lock(&fc->lock); fi->attr_version = ++fc->attr_version; - inc_nlink(inode); + if (likely(inode->i_nlink < UINT_MAX)) + inc_nlink(inode); spin_unlock(&fc->lock); fuse_invalidate_attr(inode); fuse_update_ctime(inode); -- 2.11.0