scsi: scsi_devinfo: cleanly zero-pad devinfo strings

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@suse.com>
Reviewed-by: Bart Van Assche <bart.vanassche@wdc.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/scsi/scsi_devinfo.c b/drivers/scsi/scsi_devinfo.c
index 43d4b30cbf656b7cf6ff3b936c7e4e61297ed4d0..282ea00d0f87bbc55ca15e4e7c2566af8a0f6f4e 100644 (file)
--- 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 *name, char *to, size_t to_length,
        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",