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fuse: verify nlink

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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>
This commit is contained in:
Miklos Szeredi 2019-11-12 11:49:04 +01:00
parent 8aab336b14
commit c634da718d
1 changed files with 2 additions and 1 deletions
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3
fs/fuse/dir.c
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@ -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);