linux-kernel - [PATCH AUTOSEL 5.4 3/3] nvme: clear caller pointer on identify failure

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Date: Sun, 24 Mar 2024 13:07:33 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Keith Busch <kbusch@...nel.org>,
	Christoph Hellwig <hch@....de>,
	Sasha Levin <sashal@...nel.org>,
	sagi@...mberg.me,
	linux-nvme@...ts.infradead.org
Subject: [PATCH AUTOSEL 5.4 3/3] nvme: clear caller pointer on identify failure

From: Keith Busch <kbusch@...nel.org>

[ Upstream commit 7e80eb792bd7377a20f204943ac31c77d859be89 ]

The memory allocated for the identification is freed on failure. Set
it to NULL so the caller doesn't have a pointer to that freed address.

Reviewed-by: Christoph Hellwig <hch@....de>
Signed-off-by: Keith Busch <kbusch@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/nvme/host/core.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 9144ed14b0741..0676637e1eab6 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -1080,8 +1080,10 @@ static int nvme_identify_ctrl(struct nvme_ctrl *dev, struct nvme_id_ctrl **id)
 
 	error = nvme_submit_sync_cmd(dev->admin_q, &c, *id,
 			sizeof(struct nvme_id_ctrl));
-	if (error)
+	if (error) {
 		kfree(*id);
+		*id = NULL;
+	}
 	return error;
 }
 
@@ -1193,6 +1195,7 @@ static int nvme_identify_ns(struct nvme_ctrl *ctrl,
 	if (error) {
 		dev_warn(ctrl->device, "Identify namespace failed (%d)\n", error);
 		kfree(*id);
+		*id = NULL;
 	}
 
 	return error;
-- 
2.43.0