linux-kernel - [PATCH] target: iscsi: iscsi_target_tpg.c: Cleaning up possible size overwriting in conjunction with sprintf

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Date:	Sun, 12 Oct 2014 19:55:58 +0200
From:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
To:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>,
	Sagi Grimberg <sagig@...lanox.com>
Cc:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>,
	Andy Grover <agrover@...hat.com>,
	Thomas Glanzmann <thomas@...nzmann.de>,
	Christophe Vu-Brugier <cvubrugier@...oo.fr>,
	linux-scsi@...r.kernel.org, target-devel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] target: iscsi: iscsi_target_tpg.c:  Cleaning up possible size overwriting in conjunction with sprintf

Changed same snprintf and sprintf to strlcpy and strlcat.
This will guarantee that the string size is not overwritten,
and they are significantly faster than sprintf also.

Signed-off-by: Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
---
 drivers/target/iscsi/iscsi_target_tpg.c |   16 +++++++---------
 1 file changed, 7 insertions(+), 9 deletions(-)

diff --git a/drivers/target/iscsi/iscsi_target_tpg.c b/drivers/target/iscsi/iscsi_target_tpg.c
index c3cb5c1..6fc8bfe 100644
--- a/drivers/target/iscsi/iscsi_target_tpg.c
+++ b/drivers/target/iscsi/iscsi_target_tpg.c
@@ -608,7 +608,6 @@ int iscsit_tpg_set_initiator_node_queue_depth(
 int iscsit_ta_authentication(struct iscsi_portal_group *tpg, u32 authentication)
 {
 	unsigned char buf1[256], buf2[256], *none = NULL;
-	int len;
 	struct iscsi_param *param;
 	struct iscsi_tpg_attrib *a = &tpg->tpg_attrib;
 
@@ -626,34 +625,33 @@ int iscsit_ta_authentication(struct iscsi_portal_group *tpg, u32 authentication)
 		return -EINVAL;
 
 	if (authentication) {
-		snprintf(buf1, sizeof(buf1), "%s", param->value);
+		strlcpy(buf1, param->value, sizeof(buf1));
 		none = strstr(buf1, NONE);
 		if (!none)
 			goto out;
 		if (!strncmp(none + 4, ",", 1)) {
 			if (!strcmp(buf1, none))
-				sprintf(buf2, "%s", none+5);
+				strlcpy(buf2, none+5, sizeof(buf2));
 			else {
 				none--;
 				*none = '\0';
-				len = sprintf(buf2, "%s", buf1);
+				strlcpy(buf2, buf1, sizeof(buf2));
 				none += 5;
-				sprintf(buf2 + len, "%s", none);
+				strlcat(buf2, none, sizeof(buf2));
 			}
 		} else {
 			none--;
 			*none = '\0';
-			sprintf(buf2, "%s", buf1);
+			strlcpy(buf2, buf1, sizeof(buf2));
 		}
 		if (iscsi_update_param_value(param, buf2) < 0)
 			return -EINVAL;
 	} else {
-		snprintf(buf1, sizeof(buf1), "%s", param->value);
+		strlcpy(buf1, param->value, sizeof(buf1));
 		none = strstr(buf1, NONE);
 		if (none)
 			goto out;
-		strncat(buf1, ",", strlen(","));
-		strncat(buf1, NONE, strlen(NONE));
+		strlcat(buf1, ","  NONE , sizeof(buf1));
 		if (iscsi_update_param_value(param, buf1) < 0)
 			return -EINVAL;
 	}
-- 
1.7.10.4

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