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 9CCB11D5ACD; Tue, 15 Oct 2024 11:48:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728992925; cv=none; b=qczoU6KdCmtJ8ZMrzGFp2BrJWu/9UpwGtq9pMDRMXO3qiyvHXsQe/LoVeKKxrfmwSbhBX3GCPqOp1QQXPlUj+aBU2or4zvbm7zqm5YYiRdPlduOCkbWUdLhzJV8r1xVSwf+lav+vcY90Aj/6NmUNWaksem24q205RHctlStw2ww= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728992925; c=relaxed/simple; bh=ZWbpFoJlKe2gCCb1xPO/BAOFgJhF6JZ4EoSbDosj8bI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=DqQyHzdQi3N04yevAXuz6v5kRy6jcVvJdaiusfZZZnWBTKwQCvZ9NOSyJdGpHzZvOJPIsOMfU9giOx8SHvHPUSjLaX0Oc7ViQ5yofBIHlUl4KMBFnabQLPUGMRW+wWVx4/wE7sMUO1SbOTKHfHXEjMPbMckD6CJCzvvpCoLpgRA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=0md6gdFu; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="0md6gdFu" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 062D8C4CEC6; Tue, 15 Oct 2024 11:48:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1728992925; bh=ZWbpFoJlKe2gCCb1xPO/BAOFgJhF6JZ4EoSbDosj8bI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=0md6gdFuqNcjLOr+CzWH0PH9wAnvAlN/YD5QndNedAKX9N4dAkEa5ucDjgOXKwhwG oGfkSCazjVaEKWz8VQrgf7uavOpS4A+XCDkR66g6aHre/8gMNAU2Haydtqq4114HiB Pq9pBUVkyqD6qk022dfd/Ia7D9AHPjRjjVIEZpzw= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Guoqing Jiang , Chuck Lever , Sasha Levin , Jeff Layton Subject: [PATCH 5.15 260/691] nfsd: call cache_put if xdr_reserve_space returns NULL Date: Tue, 15 Oct 2024 13:23:28 +0200 Message-ID: <20241015112450.668749828@linuxfoundation.org> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20241015112440.309539031@linuxfoundation.org> References: <20241015112440.309539031@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 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Guoqing Jiang [ Upstream commit d078cbf5c38de83bc31f83c47dcd2184c04a50c7 ] If not enough buffer space available, but idmap_lookup has triggered lookup_fn which calls cache_get and returns successfully. Then we missed to call cache_put here which pairs with cache_get. Fixes: ddd1ea563672 ("nfsd4: use xdr_reserve_space in attribute encoding") Signed-off-by: Guoqing Jiang Reviwed-by: Jeff Layton Signed-off-by: Chuck Lever Signed-off-by: Sasha Levin --- fs/nfsd/nfs4idmap.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) diff --git a/fs/nfsd/nfs4idmap.c b/fs/nfsd/nfs4idmap.c index 5e9809aff37eb..717e400b16b86 100644 --- a/fs/nfsd/nfs4idmap.c +++ b/fs/nfsd/nfs4idmap.c @@ -581,6 +581,7 @@ static __be32 idmap_id_to_name(struct xdr_stream *xdr, .id = id, .type = type, }; + __be32 status = nfs_ok; __be32 *p; int ret; struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); @@ -593,12 +594,16 @@ static __be32 idmap_id_to_name(struct xdr_stream *xdr, return nfserrno(ret); ret = strlen(item->name); WARN_ON_ONCE(ret > IDMAP_NAMESZ); + p = xdr_reserve_space(xdr, ret + 4); - if (!p) - return nfserr_resource; - p = xdr_encode_opaque(p, item->name, ret); + if (unlikely(!p)) { + status = nfserr_resource; + goto out_put; + } + xdr_encode_opaque(p, item->name, ret); +out_put: cache_put(&item->h, nn->idtoname_cache); - return 0; + return status; } static bool -- 2.43.0