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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Chengguang Xu <cgxu519@gmx.com>,
        Christoph Hellwig <hch@lst.de>,
        Sagi Grimberg <sagi@grimberg.me>,
        Keith Busch <keith.busch@intel.com>,
        Jens Axboe <axboe@kernel.dk>,
        Sasha Levin <alexander.levin@microsoft.com>
Subject: [PATCH 4.16 165/279] nvme: fix potential memory leak in option parsing
Date:   Mon, 18 Jun 2018 10:12:30 +0200
Message-Id: <20180618080615.649253719@linuxfoundation.org>
In-Reply-To: <20180618080608.851973560@linuxfoundation.org>
References: <20180618080608.851973560@linuxfoundation.org>
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4.16-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Chengguang Xu <cgxu519@gmx.com>

[ Upstream commit 59a2f3f00fd744dbad22593f47552037d3154ca6 ]

When specifying same string type option several times,
current option parsing may cause memory leak. Hence,
call kfree for previous one in this case.

Signed-off-by: Chengguang Xu <cgxu519@gmx.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/nvme/host/fabrics.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/drivers/nvme/host/fabrics.c
+++ b/drivers/nvme/host/fabrics.c
@@ -668,6 +668,7 @@ static int nvmf_parse_options(struct nvm
 				ret = -ENOMEM;
 				goto out;
 			}
+			kfree(opts->transport);
 			opts->transport = p;
 			break;
 		case NVMF_OPT_NQN:
@@ -676,6 +677,7 @@ static int nvmf_parse_options(struct nvm
 				ret = -ENOMEM;
 				goto out;
 			}
+			kfree(opts->subsysnqn);
 			opts->subsysnqn = p;
 			nqnlen = strlen(opts->subsysnqn);
 			if (nqnlen >= NVMF_NQN_SIZE) {
@@ -698,6 +700,7 @@ static int nvmf_parse_options(struct nvm
 				ret = -ENOMEM;
 				goto out;
 			}
+			kfree(opts->traddr);
 			opts->traddr = p;
 			break;
 		case NVMF_OPT_TRSVCID:
@@ -706,6 +709,7 @@ static int nvmf_parse_options(struct nvm
 				ret = -ENOMEM;
 				goto out;
 			}
+			kfree(opts->trsvcid);
 			opts->trsvcid = p;
 			break;
 		case NVMF_OPT_QUEUE_SIZE:
@@ -792,6 +796,7 @@ static int nvmf_parse_options(struct nvm
 				ret = -EINVAL;
 				goto out;
 			}
+			nvmf_host_put(opts->host);
 			opts->host = nvmf_host_add(p);
 			kfree(p);
 			if (!opts->host) {
@@ -817,6 +822,7 @@ static int nvmf_parse_options(struct nvm
 				ret = -ENOMEM;
 				goto out;
 			}
+			kfree(opts->host_traddr);
 			opts->host_traddr = p;
 			break;
 		case NVMF_OPT_HOST_ID: