netdev - [PATCH net v2] Check for skb_put

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Date:   Sun, 7 May 2017 17:15:26 +0000
From:   Peter Heise <mail@...ise.de>
To:     netdev@...r.kernel.org
Cc:     mail@...ise.de
Subject: [PATCH net v2] Check for skb_put_padto return value

Return value of skb_put_padto is now checked as
reported by Dan Carpenter. skb might be freed in
case of error in skb_put_padto.
---
 net/hsr/hsr_device.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/hsr/hsr_device.c b/net/hsr/hsr_device.c
index c73160fb11e7..a1545d09a3c9 100644
--- a/net/hsr/hsr_device.c
+++ b/net/hsr/hsr_device.c
@@ -314,7 +314,8 @@ static void send_hsr_supervision_frame(struct hsr_port *master,
 	hsr_sp = (typeof(hsr_sp)) skb_put(skb, sizeof(struct hsr_sup_payload));
 	ether_addr_copy(hsr_sp->MacAddressA, master->dev->dev_addr);
 
-	skb_put_padto(skb, ETH_ZLEN + HSR_HLEN);
+	if (skb_put_padto(skb, ETH_ZLEN + HSR_HLEN))
+		return;
 
 	hsr_forward_skb(skb, master);
 	return;
-- 
2.11.0