linux-kernel - [PATCH AUTOSEL 6.0 32/44] nvmet: fix memory leak in nvmet_subsys_attr_model_store

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Message-Id: <20221119021124.1773699-32-sashal@kernel.org>
Date:   Fri, 18 Nov 2022 21:11:12 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Aleksandr Miloserdov <a.miloserdov@...ro.com>,
        Konstantin Shelekhin <k.shelekhin@...ro.com>,
        Dmitriy Bogdanov <d.bogdanov@...ro.com>,
        Sagi Grimberg <sagi@...mberg.me>,
        Christoph Hellwig <hch@....de>,
        Sasha Levin <sashal@...nel.org>, kch@...dia.com,
        linux-nvme@...ts.infradead.org
Subject: [PATCH AUTOSEL 6.0 32/44] nvmet: fix memory leak in nvmet_subsys_attr_model_store_locked

From: Aleksandr Miloserdov <a.miloserdov@...ro.com>

[ Upstream commit becc4cac309dc867571f0080fde4426a6c2222e0 ]

Since model_number is allocated before it needs to be freed before
kmemdump_nul.

Reviewed-by: Konstantin Shelekhin <k.shelekhin@...ro.com>
Reviewed-by: Dmitriy Bogdanov <d.bogdanov@...ro.com>
Signed-off-by: Aleksandr Miloserdov <a.miloserdov@...ro.com>
Reviewed-by: Sagi Grimberg <sagi@...mberg.me>
Signed-off-by: Christoph Hellwig <hch@....de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/nvme/target/configfs.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/nvme/target/configfs.c b/drivers/nvme/target/configfs.c
index 2bcd60758919..962b64b7447e 100644
--- a/drivers/nvme/target/configfs.c
+++ b/drivers/nvme/target/configfs.c
@@ -1215,6 +1215,7 @@ static ssize_t nvmet_subsys_attr_model_store_locked(struct nvmet_subsys *subsys,
 		const char *page, size_t count)
 {
 	int pos = 0, len;
+	char *val;
 
 	if (subsys->subsys_discovered) {
 		pr_err("Can't set model number. %s is already assigned\n",
@@ -1237,9 +1238,11 @@ static ssize_t nvmet_subsys_attr_model_store_locked(struct nvmet_subsys *subsys,
 			return -EINVAL;
 	}
 
-	subsys->model_number = kmemdup_nul(page, len, GFP_KERNEL);
-	if (!subsys->model_number)
+	val = kmemdup_nul(page, len, GFP_KERNEL);
+	if (!val)
 		return -ENOMEM;
+	kfree(subsys->model_number);
+	subsys->model_number = val;
 	return count;
 }
 
-- 
2.35.1