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 491822F24 for ; Wed, 12 Apr 2023 08:40:18 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id C34AAC433EF; Wed, 12 Apr 2023 08:40:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1681288818; bh=d6SfSzroS3PhQ+bfyKRfetIkzFFtPKIlAUM3BekxO1I=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=h9qDbIu2CyDtezPDLFLPLC2ddZ3BLt4KjOxqJ1zjFIXHyw5hErSXyFQxXU1UdEWfX trpACT1RVClWOBs7jqXVclXx3cMuVGy8O8OL6uip7mo95w5ABMnsQIAYY2HaS0S905 W0WDtsrtr8whoVKmHAK8vdciHdi67Zzugrh50Oaw= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Zhi Li , Jeff Layton , Chuck Lever , Sasha Levin Subject: [PATCH 6.1 029/164] nfsd: call op_release, even when op_func returns an error Date: Wed, 12 Apr 2023 10:32:31 +0200 Message-Id: <20230412082838.162285504@linuxfoundation.org> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230412082836.695875037@linuxfoundation.org> References: <20230412082836.695875037@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Jeff Layton [ Upstream commit 15a8b55dbb1ba154d82627547c5761cac884d810 ] For ops with "trivial" replies, nfsd4_encode_operation will shortcut most of the encoding work and skip to just marshalling up the status. One of the things it skips is calling op_release. This could cause a memory leak in the layoutget codepath if there is an error at an inopportune time. Have the compound processing engine always call op_release, even when op_func sets an error in op->status. With this change, we also need nfsd4_block_get_device_info_scsi to set the gd_device pointer to NULL on error to avoid a double free. Reported-by: Zhi Li Link: https://bugzilla.redhat.com/show_bug.cgi?id=2181403 Fixes: 34b1744c91cc ("nfsd4: define ->op_release for compound ops") Signed-off-by: Jeff Layton Signed-off-by: Chuck Lever Signed-off-by: Sasha Levin --- fs/nfsd/blocklayout.c | 1 + fs/nfsd/nfs4xdr.c | 11 +++++------ 2 files changed, 6 insertions(+), 6 deletions(-) diff --git a/fs/nfsd/blocklayout.c b/fs/nfsd/blocklayout.c index b6d01d51a7465..e7e6e78d965db 100644 --- a/fs/nfsd/blocklayout.c +++ b/fs/nfsd/blocklayout.c @@ -296,6 +296,7 @@ nfsd4_block_get_device_info_scsi(struct super_block *sb, out_free_dev: kfree(dev); + gdp->gd_device = NULL; return ret; } diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c index 405087bda8cc1..8f5b41dc07734 100644 --- a/fs/nfsd/nfs4xdr.c +++ b/fs/nfsd/nfs4xdr.c @@ -5353,10 +5353,8 @@ nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op) __be32 *p; p = xdr_reserve_space(xdr, 8); - if (!p) { - WARN_ON_ONCE(1); - return; - } + if (!p) + goto release; *p++ = cpu_to_be32(op->opnum); post_err_offset = xdr->buf->len; @@ -5371,8 +5369,6 @@ nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op) op->status = encoder(resp, op->status, &op->u); if (op->status) trace_nfsd_compound_encode_err(rqstp, op->opnum, op->status); - if (opdesc && opdesc->op_release) - opdesc->op_release(&op->u); xdr_commit_encode(xdr); /* nfsd4_check_resp_size guarantees enough room for error status */ @@ -5413,6 +5409,9 @@ nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op) } status: *p = op->status; +release: + if (opdesc && opdesc->op_release) + opdesc->op_release(&op->u); } /* -- 2.39.2