[SCSI] fusion: ensure NUL-termination of MptCallbacksName elements

Using strlcpy instead of memcpy makes the strlen() calls superfluous
and also ensures zero-termination of the copied string.
At the same time get rid of the magic constant 50.

Actually, I can't see why copying the callback name is necessary
instead of simply storing a pointer to it (just like to the callback
function itself), but that goes beyond the scope of this fix.

Signed-off-by: Ferenc Wagner <wferi@niif.hu>
Acked-by: "Nandigama, Nagalakshmi" <Nagalakshmi.Nandigama@lsi.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

2 files changed, 5 insertions, 3 deletions

diff --git a/drivers/message/fusion/mptbase.c b/drivers/message/fusion/mptbase.c
index e9c6a6047a00..a7dc4672d996 100644
--- a/drivers/message/fusion/mptbase.c
+++ b/drivers/message/fusion/mptbase.c
@@ -115,7 +115,8 @@ module_param(mpt_fwfault_debug, int, 0600);
 MODULE_PARM_DESC(mpt_fwfault_debug,
                  "Enable detection of Firmware fault and halt Firmware on fault - (default=0)");
 
-static char     MptCallbacksName[MPT_MAX_PROTOCOL_DRIVERS][50];
+static char     MptCallbacksName[MPT_MAX_PROTOCOL_DRIVERS]
+                                [MPT_MAX_CALLBACKNAME_LEN+1];
 
 #ifdef MFCNT
 static int mfcounter = 0;
@@ -717,8 +718,8 @@ mpt_register(MPT_CALLBACK cbfunc, MPT_DRIVER_CLASS dclass, char *func_name)
                         MptDriverClass[cb_idx] = dclass;
                         MptEvHandlers[cb_idx] = NULL;
                         last_drv_idx = cb_idx;
-                        memcpy(MptCallbacksName[cb_idx], func_name,
-                            strlen(func_name) > 50 ? 50 : strlen(func_name));
+                        strlcpy(MptCallbacksName[cb_idx], func_name,
+                                MPT_MAX_CALLBACKNAME_LEN+1);
                         break;
                 }
         }
diff --git a/drivers/message/fusion/mptbase.h b/drivers/message/fusion/mptbase.h
index b4d24dc081ae..76c05bc24cb7 100644
--- a/drivers/message/fusion/mptbase.h
+++ b/drivers/message/fusion/mptbase.h
@@ -89,6 +89,7 @@
  */
 #define MPT_MAX_ADAPTERS                18
 #define MPT_MAX_PROTOCOL_DRIVERS        16
+#define MPT_MAX_CALLBACKNAME_LEN        49
 #define MPT_MAX_BUS                     1       /* Do not change */
 #define MPT_MAX_FC_DEVICES              255
 #define MPT_MAX_SCSI_DEVICES            16