linux-kernel - [PATCH] net: qlge: use memmove instead of skb_copy_to_linear

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Date:   Fri,  2 Feb 2018 16:45:44 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Harish Patil <harish.patil@...ium.com>,
        Manish Chopra <manish.chopra@...ium.com>,
        Dept-GELinuxNICDev@...ium.com
Cc:     Arnd Bergmann <arnd@...db.de>,
        "David S. Miller" <davem@...emloft.net>,
        Kees Cook <keescook@...omium.org>,
        Johannes Berg <johannes.berg@...el.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] net: qlge: use memmove instead of skb_copy_to_linear_data

gcc-8 points out that the skb_copy_to_linear_data() argument points to
the skb itself, which makes it run into a problem with overlapping
memcpy arguments:

In file included from include/linux/ip.h:20,
                 from drivers/net/ethernet/qlogic/qlge/qlge_main.c:26:
drivers/net/ethernet/qlogic/qlge/qlge_main.c: In function 'ql_realign_skb':
include/linux/skbuff.h:3378:2: error: 'memcpy' source argument is the same as destination [-Werror=restrict]
  memcpy(skb->data, from, len);

It's unclear to me what the best solution is, maybe it ought to use a
different helper that adjusts the skb data in a safe way. Simply using
memmove() here seems like the easiest workaround.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/net/ethernet/qlogic/qlge/qlge_main.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/qlogic/qlge/qlge_main.c b/drivers/net/ethernet/qlogic/qlge/qlge_main.c
index 7b97a9969046..50038d946ced 100644
--- a/drivers/net/ethernet/qlogic/qlge/qlge_main.c
+++ b/drivers/net/ethernet/qlogic/qlge/qlge_main.c
@@ -1747,8 +1747,7 @@ static void ql_realign_skb(struct sk_buff *skb, int len)
 	 */
 	skb->data -= QLGE_SB_PAD - NET_IP_ALIGN;
 	skb->tail -= QLGE_SB_PAD - NET_IP_ALIGN;
-	skb_copy_to_linear_data(skb, temp_addr,
-		(unsigned int)len);
+	memmove(skb->data, temp_addr, len);
 }
 
 /*
-- 
2.9.0