linux-kernel - [PATCH 4.4 281/312] net: bridge: dont increment tx_dropped in br_do_proxy

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Date:   Fri,  8 May 2020 14:34:32 +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, Kyeyoon Park <kyeyoonp@...eaurora.org>,
        Roopa Prabhu <roopa@...ulusnetworks.com>,
        Stephen Hemminger <stephen@...workplumber.org>,
        bridge@...ts.linux-foundation.org,
        Nikolay Aleksandrov <nikolay@...ulusnetworks.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.4 281/312] net: bridge: dont increment tx_dropped in br_do_proxy_arp

From: Nikolay Aleksandrov <nikolay@...ulusnetworks.com>

commit 85a3d4a9356b595d5440c3f1bf07ee7cecca1567 upstream.

pskb_may_pull may fail due to various reasons (e.g. alloc failure), but the
skb isn't changed/dropped and processing continues so we shouldn't
increment tx_dropped.

CC: Kyeyoon Park <kyeyoonp@...eaurora.org>
CC: Roopa Prabhu <roopa@...ulusnetworks.com>
CC: Stephen Hemminger <stephen@...workplumber.org>
CC: bridge@...ts.linux-foundation.org
Fixes: 958501163ddd ("bridge: Add support for IEEE 802.11 Proxy ARP")
Signed-off-by: Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 net/bridge/br_input.c |    7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

--- a/net/bridge/br_input.c
+++ b/net/bridge/br_input.c
@@ -78,13 +78,10 @@ static void br_do_proxy_arp(struct sk_bu

 	BR_INPUT_SKB_CB(skb)->proxyarp_replied = false;

-	if (dev->flags & IFF_NOARP)
+	if ((dev->flags & IFF_NOARP) ||
+	    !pskb_may_pull(skb, arp_hdr_len(dev)))
 		return;

-	if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
-		dev->stats.tx_dropped++;
-		return;
-	}
 	parp = arp_hdr(skb);

 	if (parp->ar_pro != htons(ETH_P_IP) ||