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HSI: ssi_protocol: double free in ssip_pn_xmit()

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[ 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 <dan.carpenter@oracle.com>
Signed-off-by: Sebastian Reichel <sre@kernel.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dan Carpenter 2017-04-21 13:39:09 +03:00 • committed by Greg Kroah-Hartman
parent 8716c87ec2
commit fd63c2b253
1 changed files with 3 additions and 2 deletions
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5
drivers/hsi/clients/ssi_protocol.c
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@ -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;
}