linux-kernel - [PATCH 3.4 48/91] iscsi-target: avoid NULL pointer in iscsi_copy_param

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Message-Id: <1417077794-9299-48-git-send-email-lizf@kernel.org>
Date:	Thu, 27 Nov 2014 16:42:31 +0800
From:	lizf@...nel.org
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Joern Engel <joern@...fs.org>,
	Nicholas Bellinger <nab@...ux-iscsi.org>,
	Zefan Li <lizefan@...wei.com>
Subject: [PATCH 3.4 48/91] iscsi-target: avoid NULL pointer in iscsi_copy_param_list failure

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

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

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


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: Zefan Li <lizefan@...wei.com>
---
 drivers/target/iscsi/iscsi_target_parameters.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/target/iscsi/iscsi_target_parameters.c b/drivers/target/iscsi/iscsi_target_parameters.c
index 8a8ff23..ed4abad 100644
--- 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);
-- 
1.9.1

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