[PATCH 4.19 09/32] s390/ctcm: fix potential memory leak

Greg Kroah-Hartman
2022-05-16T19:45:33Z

From: Alexandra Winter <wintera@linux.ibm.com>

[ Upstream commit 0c0b20587b9f25a2ad14db7f80ebe49bdf29920a ]

smatch complains about
drivers/s390/net/ctcm_mpc.c:1210 ctcmpc_unpack_skb() warn: possible memory leak of 'mpcginfo'

mpc_action_discontact() did not free mpcginfo. Consolidate the freeing in
ctcmpc_unpack_skb().

Fixes: 293d984f0e36 ("ctcm: infrastructure for replaced ctc driver")
Signed-off-by: Alexandra Winter <wintera@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/s390/net/ctcm_mpc.c | 6 +-----
1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/drivers/s390/net/ctcm_mpc.c b/drivers/s390/net/ctcm_mpc.c
index e02f295d38a9..07d9668137df 100644
--- a/drivers/s390/net/ctcm_mpc.c
+++ b/drivers/s390/net/ctcm_mpc.c
@@ -625,8 +625,6 @@ static void mpc_rcvd_sweep_resp(struct mpcg_info *mpcginfo)
ctcm_clear_busy_do(dev);
}

- kfree(mpcginfo);
-
return;

}
@@ -1205,10 +1203,10 @@ static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb)
CTCM_FUNTAIL, dev->name);
priv->stats.rx_dropped++;
/* mpcginfo only used for non-data transfers */
- kfree(mpcginfo);
if (do_debug_data)
ctcmpc_dump_skb(pskb, -8);
}
+ kfree(mpcginfo);
}
done:

@@ -1991,7 +1989,6 @@ static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg)
}
break;
}
- kfree(mpcginfo);

CTCM_PR_DEBUG("ctcmpc:%s() %s xid2:%i xid7:%i xidt_p2:%i \n",
__func__, ch->id, grp->outstanding_xid2,
@@ -2052,7 +2049,6 @@ static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg)
mpc_validate_xid(mpcginfo);
break;
}
- kfree(mpcginfo);
return;
}

--
2.35.1