netdev - [PATCH net] Fix net/hsr/hsr_device to check for freed skb buffer.

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Date:   Thu, 20 Apr 2017 07:28:31 +0000
From:   Peter Heise <mail@...ise.de>
To:     Arvid Brodin <arvid.brodin@...en.se>,
        "David S. Miller" <davem@...emloft.net>
Cc:     netdev@...r.kernel.org
Subject: [PATCH net] Fix net/hsr/hsr_device to check for freed skb buffer.

Fixed an unchecked call of skb_put_padto. Return value was ignored
before, however, skb_put_padto frees skb buffer in case of error.

As reported by Dan Carpenter on kernel-janitors.

Signed-off-by: Peter Heise <mail@...ise.de>
---
 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..22d693f213be 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