linux-kernel - [PATCH 4.9 020/101] scsi: scsi_devinfo: cleanly zero-pad devinfo strings

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Date:   Thu,  6 Dec 2018 15:38:19 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Martin Wilck <mwilck@...e.com>,
        Bart Van Assche <bart.vanassche@....com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Subject: [PATCH 4.9 020/101] scsi: scsi_devinfo: cleanly zero-pad devinfo strings

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

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

From: Martin Wilck <mwilck@...e.com>

commit 81df022b688d43d2a3667518b2f755d384397910 upstream.

Cleanly fill memory for "vendor" and "model" with 0-bytes for the
"compatible" case rather than adding only a single 0 byte.  This
simplifies the devinfo code a a bit, and avoids mistakes in other places
of the code (not in current upstream, but we had one such mistake in the
SUSE kernel).

[mkp: applied by hand and added braces]

Signed-off-by: Martin Wilck <mwilck@...e.com>
Reviewed-by: Bart Van Assche <bart.vanassche@....com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/scsi/scsi_devinfo.c |   22 +++++++---------------
 1 file changed, 7 insertions(+), 15 deletions(-)

--- a/drivers/scsi/scsi_devinfo.c
+++ b/drivers/scsi/scsi_devinfo.c
@@ -33,7 +33,6 @@ struct scsi_dev_info_list_table {
 };
 
 
-static const char spaces[] = "                "; /* 16 of them */
 static unsigned scsi_default_dev_flags;
 static LIST_HEAD(scsi_dev_info_list);
 static char scsi_dev_flags[256];
@@ -298,20 +297,13 @@ static void scsi_strcpy_devinfo(char *na
 	size_t from_length;
 
 	from_length = strlen(from);
-	strncpy(to, from, min(to_length, from_length));
-	if (from_length < to_length) {
-		if (compatible) {
-			/*
-			 * NUL terminate the string if it is short.
-			 */
-			to[from_length] = '\0';
-		} else {
-			/* 
-			 * space pad the string if it is short. 
-			 */
-			strncpy(&to[from_length], spaces,
-				to_length - from_length);
-		}
+	/* this zero-pads the destination */
+	strncpy(to, from, to_length);
+	if (from_length < to_length && !compatible) {
+		/*
+		 * space pad the string if it is short.
+		 */
+		memset(&to[from_length], ' ', to_length - from_length);
 	}
 	if (from_length > to_length)
 		 printk(KERN_WARNING "%s: %s string '%s' is too long\n",