linux-kernel - RE: [PATCH v2] SCSI: fusion: ensure NUL-termination of MptCallbacksName elements

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Message-ID: <A6888A6805518E4EA4AF7072A28264A604726F2849@inbmail02.lsi.com>
Date:	Mon, 28 Nov 2011 12:32:05 +0530
From:	"Nandigama, Nagalakshmi" <Nagalakshmi.Nandigama@....com>
To:	Ferenc Wagner <wferi@...f.hu>,
	Andrew Morton <akpm@...ux-foundation.org>
CC:	"Desai, Kashyap" <Kashyap.Desai@....com>,
	Support <support@....com>,
	DL-MPT Fusion Linux <DL-MPTFusionLinux@....com>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v2] SCSI: fusion: ensure NUL-termination of
 MptCallbacksName elements

The patch seem to be fine. Please consider this patch as an Acked by me.

Regards,
Nagalakshmi


-----Original Message-----
From: Ferenc Wagner [mailto:wferi@...f.hu] 
Sent: Thursday, August 25, 2011 6:15 PM
To: Andrew Morton
Cc: Desai, Kashyap; Support; DL-MPT Fusion Linux; linux-scsi@...r.kernel.org; linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] 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@...f.hu>
---
 drivers/message/fusion/mptbase.c |    7 ++++---
 drivers/message/fusion/mptbase.h |    1 +
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/message/fusion/mptbase.c b/drivers/message/fusion/mptbase.c
index e9c6a60..a7dc467 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 b4d24dc..76c05bc 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
-- 
1.6.5

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