From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 83C4C15AD3 for ; Wed, 20 Sep 2023 12:39:16 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id B8B36C43391; Wed, 20 Sep 2023 12:39:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1695213556; bh=MWn8rNWEXCBI3dmlx4PY9Qp5TCptfbIg5BHviAx/sP8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=uVz7RlOvmReIGOvwmQpEEVW7AWlx4bToFAyYUNZN36ZjbdzSE8VQdhA+9jMA5Inia Ve9H9RatUxqt9lIgR3vp7iV1OUPBjBzHWynOBPNdrkd5KQSmdkdjElqe3O7ad7m9O4 vsVQBe/aNCbBSCj7XyCmLotYzT2URX+eWwV8KPXc= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, ruanmeisi , Miklos Szeredi Subject: [PATCH 5.4 281/367] fuse: nlookup missing decrement in fuse_direntplus_link Date: Wed, 20 Sep 2023 13:30:58 +0200 Message-ID: <20230920112905.837442296@linuxfoundation.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20230920112858.471730572@linuxfoundation.org> References: <20230920112858.471730572@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: ruanmeisi commit b8bd342d50cbf606666488488f9fea374aceb2d5 upstream. During our debugging of glusterfs, we found an Assertion failed error: inode_lookup >= nlookup, which was caused by the nlookup value in the kernel being greater than that in the FUSE file system. The issue was introduced by fuse_direntplus_link, where in the function, fuse_iget increments nlookup, and if d_splice_alias returns failure, fuse_direntplus_link returns failure without decrementing nlookup https://github.com/gluster/glusterfs/pull/4081 Signed-off-by: ruanmeisi Fixes: 0b05b18381ee ("fuse: implement NFS-like readdirplus support") Cc: # v3.9 Signed-off-by: Miklos Szeredi Signed-off-by: Greg Kroah-Hartman --- fs/fuse/readdir.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) --- a/fs/fuse/readdir.c +++ b/fs/fuse/readdir.c @@ -238,8 +238,16 @@ retry: dput(dentry); dentry = alias; } - if (IS_ERR(dentry)) + if (IS_ERR(dentry)) { + if (!IS_ERR(inode)) { + struct fuse_inode *fi = get_fuse_inode(inode); + + spin_lock(&fi->lock); + fi->nlookup--; + spin_unlock(&fi->lock); + } return PTR_ERR(dentry); + } } if (fc->readdirplus_auto) set_bit(FUSE_I_INIT_RDPLUS, &get_fuse_inode(inode)->state);