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 AAE861D416E; Wed, 6 Nov 2024 12:12:55 +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=1730895175; cv=none; b=P0NQWyXuYv79AAvCVpnF6ityuCTDXlAygYoFcnQzxaARcdcDum3+KK+wf+9kqBnXv1v2hNlxCGwI8suh4DtpCDpfXVqae2dndFeDdTetBj4Hnb8hakotXgyMWd1Xf461kZnb/eoM+YCY9i5/M2oC+00BLwjZnGx9O1DXdFFg0Ug= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730895175; c=relaxed/simple; bh=BFuseyQYKbiouNGdDKoTstwyjF+UCXO/sprBHKmvCPk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=owwVQKaGH3t5ZCSVYJN7uj3lNSvmH0iAAa3gYAdCeoUj5ZqGc6XszXGm04WY8t7YqpRcu/JrEGd2aF2kQYcdC+PiWrkrcKceqCv4HZVdEV+3YCwN1LpVLLMsS/T121JNYLegci/XHYmtYIz4CT8XvWff7SRM/ggduvnVnsHWSIE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=wKm2YDis; 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="wKm2YDis" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2F63DC4CECD; Wed, 6 Nov 2024 12:12:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1730895175; bh=BFuseyQYKbiouNGdDKoTstwyjF+UCXO/sprBHKmvCPk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=wKm2YDiskDd1yQ99JqUkjf+KXcH+YoXpTbhD37wJuLa5y4l7udFL+3opB3saiuo6M ME5YrZ6DaZvKRlRNRnObCehzzzxKKP3OATL13XqhJbJc4QXE7kgKRmezT1f3uOXp+D 4UMvozn7K0fHIyg+yiFwN4Vgb+/I/O0x4vqi7qSU= 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 4.19 093/350] nfsd: call cache_put if xdr_reserve_space returns NULL Date: Wed, 6 Nov 2024 13:00:21 +0100 Message-ID: <20241106120323.199293602@linuxfoundation.org> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20241106120320.865793091@linuxfoundation.org> References: <20241106120320.865793091@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 4.19-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 a5bb76593ce72..de6bab641b20c 100644 --- a/fs/nfsd/nfs4idmap.c +++ b/fs/nfsd/nfs4idmap.c @@ -565,6 +565,7 @@ 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); @@ -577,12 +578,16 @@ 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