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fuse: verify nlink 

commit c634da718d upstream.

When adding a new hard link, make sure that i_nlink doesn't overflow.

Fixes: ac45d61357 ("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>
5.4-rM2-2.2.x-imx-squashed
Miklos Szeredi 2019-11-12 11:49:04 +01:00 committed by Greg Kroah-Hartman
parent a266e9072a
commit ba916a1310
1 changed files with 2 additions and 1 deletions
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3
fs/fuse/dir.c
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@ -862,7 +862,8 @@ 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);