linux-kernel - [PATCH 3.2 054/102] iscsi-target: avoid NULL pointer in iscsi_copy_param

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Message-ID: <lsq.1414880883.106217878@decadent.org.uk>
Date:	Sat, 01 Nov 2014 22:28:03 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"Nicholas Bellinger" <nab@...ux-iscsi.org>,
	"Joern Engel" <joern@...fs.org>
Subject: [PATCH 3.2 054/102] iscsi-target: avoid NULL pointer in
 iscsi_copy_param_list failure

3.2.64-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Joern Engel <joern@...fs.org>

commit 8ae757d09c45102b347a1bc2867f54ffc1ab8fda upstream.

In iscsi_copy_param_list() a failed iscsi_param_list memory allocation
currently invokes iscsi_release_param_list() to cleanup, and will promptly
trigger a NULL pointer dereference.

Instead, go ahead and return for the first iscsi_copy_param_list()
failure case.

Found by coverity.

Signed-off-by: Joern Engel <joern@...fs.org>
Signed-off-by: Nicholas Bellinger <nab@...ux-iscsi.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/target/iscsi/iscsi_target_parameters.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/target/iscsi/iscsi_target_parameters.c
+++ b/drivers/target/iscsi/iscsi_target_parameters.c
@@ -552,7 +552,7 @@ int iscsi_copy_param_list(
 	param_list = kzalloc(sizeof(struct iscsi_param_list), GFP_KERNEL);
 	if (!param_list) {
 		pr_err("Unable to allocate memory for struct iscsi_param_list.\n");
-		goto err_out;
+		return -1;
 	}
 	INIT_LIST_HEAD(&param_list->param_list);
 	INIT_LIST_HEAD(&param_list->extra_response_list);

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