| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.14 121/267] fuse: verify nlink | Date | Mon, 16 Dec 2019 18:47:27 +0100 |
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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 @@ -830,7 +830,8 @@ 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);
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