linux-kernel - [PATCH 4.4 290/312] mvpp2: use correct size for memset

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Message-Id: <20200508123144.777181962@linuxfoundation.org>
Date:   Fri,  8 May 2020 14:34:41 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.4 290/312] mvpp2: use correct size for memset

From: Arnd Bergmann <arnd@...db.de>

commit e8f967c3d88489fc1562a31d4e44d905ac1d3aff upstream.

gcc-7 detects a short memset in mvpp2, introduced in the original
merge of the driver:

drivers/net/ethernet/marvell/mvpp2.c: In function 'mvpp2_cls_init':
drivers/net/ethernet/marvell/mvpp2.c:3296:2: error: 'memset' used with length equal to number of elements without multiplication by element size [-Werror=memset-elt-size]

The result seems to be that we write uninitialized data into the
flow table registers, although we did not get any warning about
that uninitialized data usage.

Using sizeof() lets us initialize then entire array instead.

Fixes: 3f518509dedc ("ethernet: Add new driver for Marvell Armada 375 network unit")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/net/ethernet/marvell/mvpp2.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/ethernet/marvell/mvpp2.c
+++ b/drivers/net/ethernet/marvell/mvpp2.c
@@ -3305,7 +3305,7 @@ static void mvpp2_cls_init(struct mvpp2
 	mvpp2_write(priv, MVPP2_CLS_MODE_REG, MVPP2_CLS_MODE_ACTIVE_MASK);
 
 	/* Clear classifier flow table */
-	memset(&fe.data, 0, MVPP2_CLS_FLOWS_TBL_DATA_WORDS);
+	memset(&fe.data, 0, sizeof(fe.data));
 	for (index = 0; index < MVPP2_CLS_FLOWS_TBL_SIZE; index++) {
 		fe.index = index;
 		mvpp2_cls_flow_write(priv, &fe);