[PATCH 3.16 072/134] HSI: ssi_protocol: double free in ssip_pn_xmit()

Ben Hutchings
2017-08-18T13:15:47Z

From: Dan Carpenter <dan.carpenter@oracle.com>

commit 3026050179a3a9a6f5c892c414b5e36ecf092081 upstream.

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 <dan.carpenter@oracle.com>
Signed-off-by: Sebastian Reichel <sre@kernel.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
drivers/hsi/clients/ssi_protocol.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

--- 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 *
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 *
drop2:
hsi_free_msg(msg);
drop:
- dev->stats.tx_dropped++;
dev_kfree_skb(skb);
+inc_dropped:
+ dev->stats.tx_dropped++;

return 0;
}