From c7253a417a33c71c6befecbc9d8520296c8ef02a Mon Sep 17 00:00:00 2001 From: Dan Carpenter Date: Fri, 21 Apr 2017 13:39:09 +0300 Subject: [PATCH] HSI: ssi_protocol: double free in ssip_pn_xmit() [ Upstream commit 3026050179a3a9a6f5c892c414b5e36ecf092081 ] If skb_pad() fails then it frees skb and we don't need to free it again at the end of the function. Fixes: dc7bf5d7 ("HSI: Introduce driver for SSI Protocol") Signed-off-by: Dan Carpenter Signed-off-by: Sebastian Reichel Signed-off-by: Sasha Levin --- drivers/hsi/clients/ssi_protocol.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/hsi/clients/ssi_protocol.c b/drivers/hsi/clients/ssi_protocol.c index e5c7a969f28b9..0cb78f30696b0 100644 --- a/drivers/hsi/clients/ssi_protocol.c +++ b/drivers/hsi/clients/ssi_protocol.c @@ -976,7 +976,7 @@ static int ssip_pn_xmit(struct sk_buff *skb, struct net_device *dev) goto drop; /* Pad to 32-bits - FIXME: Revisit*/ if ((skb->len & 3) && skb_pad(skb, 4 - (skb->len & 3))) - goto drop; + goto inc_dropped; /* * Modem sends Phonet messages over SSI with its own endianess... @@ -1028,8 +1028,9 @@ static int ssip_pn_xmit(struct sk_buff *skb, struct net_device *dev) drop2: hsi_free_msg(msg); drop: - dev->stats.tx_dropped++; dev_kfree_skb(skb); +inc_dropped: + dev->stats.tx_dropped++; return 0; } -- 2.47.2