| From c634da718db9b2fac201df2ae1b1b095344ce5eb Mon Sep 17 00:00:00 2001 |
| From: Miklos Szeredi <mszeredi@redhat.com> |
| Date: Tue, 12 Nov 2019 11:49:04 +0100 |
| Subject: fuse: verify nlink |
| |
| From: Miklos Szeredi <mszeredi@redhat.com> |
| |
| 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: <stable@vger.kernel.org> # v3.4 |
| Signed-off-by: Miklos Szeredi <mszeredi@redhat.com> |
| Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| |
| --- |
| fs/fuse/dir.c | 3 ++- |
| 1 file changed, 2 insertions(+), 1 deletion(-) |
| |
| --- a/fs/fuse/dir.c |
| +++ b/fs/fuse/dir.c |
| @@ -918,7 +918,8 @@ static int fuse_link(struct dentry *entr |
| |
| 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); |