linux-kernel - [PATCH] drivers: nvme: target: core: deref after null

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Date: Fri,  7 Jun 2024 16:43:39 +0300
From: Alexander Sapozhnikov <alsp705@...il.com>
To: Christoph Hellwig <hch@....de>,
	Sagi Grimberg <sagi@...mberg.me>,
	Chaitanya Kulkarni <kch@...dia.com>
Cc: Alexandr Sapozhnikov <alsp705@...il.com>,
	linux-nvme@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	lvc-project@...uxtesting.org
Subject: [PATCH] drivers: nvme: target: core: deref after null

From: Alexandr Sapozhnikov <alsp705@...il.com>

After having been compared to a NULL value at core.c:813, 
pointer '(**sq->ctrl).sqs' is dereferenced at core.c:838.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Signed-off-by: Alexandr Sapozhnikov <alsp705@...il.com>
---
 drivers/nvme/target/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/nvme/target/core.c b/drivers/nvme/target/core.c
index 06f0c587f343..5a67d2bc0c55 100644
--- a/drivers/nvme/target/core.c
+++ b/drivers/nvme/target/core.c
@@ -827,7 +827,7 @@ void nvmet_sq_destroy(struct nvmet_sq *sq)
 	 */
 	ctrl = sq->ctrl;
 
-	if (ctrl) {
+	if (ctrl && ctrl->sqs) {
 		/*
 		 * The teardown flow may take some time, and the host may not
 		 * send us keep-alive during this period, hence reset the
-- 
2.39.2