linux-kernel - [PATCH 3.12 058/212] iscsi-target: fix extract_param to handle buffer length corner case

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Message-Id: <20131202191254.574816052@linuxfoundation.org>
Date:	Mon,  2 Dec 2013 11:14:09 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Eric Seppanen <eric@...estorage.com>,
	Nicholas Bellinger <nab@...ux-iscsi.org>
Subject: [PATCH 3.12 058/212] iscsi-target: fix extract_param to handle buffer length corner case

3.12-stable review patch.  If anyone has any objections, please let me know.

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

From: Eric Seppanen <eric@...estorage.com>

commit 369653e4fb511928511b0ce81f41c812ff1f28b6 upstream.

extract_param() is called with max_length set to the total size of the
output buffer.  It's not safe to allow a parameter length equal to the
buffer size as the terminating null would be written one byte past the
end of the output buffer.

Signed-off-by: Eric Seppanen <eric@...estorage.com>
Signed-off-by: Nicholas Bellinger <nab@...ux-iscsi.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/target/iscsi/iscsi_target_nego.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/target/iscsi/iscsi_target_nego.c
+++ b/drivers/target/iscsi/iscsi_target_nego.c
@@ -88,7 +88,7 @@ int extract_param(
 	if (len < 0)
 		return -1;
 
-	if (len > max_length) {
+	if (len >= max_length) {
 		pr_err("Length of input: %d exceeds max_length:"
 			" %d\n", len, max_length);
 		return -1;


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