netdev - [PATCH v2 net-next 1/5] ptp: clockmatrix: bug fix for idtcm

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Date:   Tue, 17 Nov 2020 11:05:58 -0500
From:   <min.li.xe@...esas.com>
To:     <richardcochran@...il.com>
CC:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Min Li <min.li.xe@...esas.com>
Subject: [PATCH v2 net-next 1/5] ptp: clockmatrix: bug fix for idtcm_strverscmp

From: Min Li <min.li.xe@...esas.com>

Feed kstrtou8 with NULL terminated string.

Changes since v1:
-Only strcpy 15 characters to leave 1 space for '\0'

Signed-off-by: Min Li <min.li.xe@...esas.com>
---
 drivers/ptp/ptp_clockmatrix.c | 52 +++++++++++++++++++++++++++++++------------
 1 file changed, 38 insertions(+), 14 deletions(-)

diff --git a/drivers/ptp/ptp_clockmatrix.c b/drivers/ptp/ptp_clockmatrix.c
index e020faf..efe5639 100644
--- a/drivers/ptp/ptp_clockmatrix.c
+++ b/drivers/ptp/ptp_clockmatrix.c
@@ -103,42 +103,66 @@ static int timespec_to_char_array(struct timespec64 const *ts,
 	return 0;
 }
 
-static int idtcm_strverscmp(const char *ver1, const char *ver2)
+static int idtcm_strverscmp(const char *version1, const char *version2)
 {
 	u8 num1;
 	u8 num2;
 	int result = 0;
+	char ver1[16];
+	char ver2[16];
+	char *cur1;
+	char *cur2;
+	char *next1;
+	char *next2;
+
+	strncpy(ver1, version1, 15);
+	strncpy(ver2, version2, 15);
+	cur1 = ver1;
+	cur2 = ver2;
 
 	/* loop through each level of the version string */
 	while (result == 0) {
+		next1 = strchr(cur1, '.');
+		next2 = strchr(cur2, '.');
+
+		/* kstrtou8 could fail for dot */
+		if (next1) {
+			*next1 = '\0';
+			next1++;
+		}
+
+		if (next2) {
+			*next2 = '\0';
+			next2++;
+		}
+
 		/* extract leading version numbers */
-		if (kstrtou8(ver1, 10, &num1) < 0)
+		if (kstrtou8(cur1, 10, &num1) < 0)
 			return -1;
 
-		if (kstrtou8(ver2, 10, &num2) < 0)
+		if (kstrtou8(cur2, 10, &num2) < 0)
 			return -1;
 
 		/* if numbers differ, then set the result */
-		if (num1 < num2)
+		if (num1 < num2) {
 			result = -1;
-		else if (num1 > num2)
+		} else if (num1 > num2) {
 			result = 1;
-		else {
+		} else {
 			/* if numbers are the same, go to next level */
-			ver1 = strchr(ver1, '.');
-			ver2 = strchr(ver2, '.');
-			if (!ver1 && !ver2)
+			if (!next1 && !next2)
 				break;
-			else if (!ver1)
+			else if (!next1) {
 				result = -1;
-			else if (!ver2)
+			} else if (!next2) {
 				result = 1;
-			else {
-				ver1++;
-				ver2++;
+			} else {
+				cur1 = next1;
+				cur2 = next2;
 			}
 		}
 	}
+
 	return result;
 }
 
-- 
2.7.4