netdev - [PATCH net-next] ibmvnic: Potential NULL dereference in clean_one_tx

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Date:   Fri, 23 Mar 2018 14:36:15 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Thomas Falcon <tlfalcon@...ux.vnet.ibm.com>
Cc:     John Allen <jallen@...ux.vnet.ibm.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>, netdev@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, kernel-janitors@...r.kernel.org
Subject: [PATCH net-next] ibmvnic: Potential NULL dereference in
 clean_one_tx_pool()

There is an && vs || typo here, which potentially leads to a NULL
dereference.

Fixes: e9e1e97884b7 ("ibmvnic: Update TX pool cleaning routine")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
index 5632c030811b..0389a7a52152 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -1135,7 +1135,7 @@ static void clean_one_tx_pool(struct ibmvnic_adapter *adapter,
 	u64 tx_entries;
 	int i;
 
-	if (!tx_pool && !tx_pool->tx_buff)
+	if (!tx_pool || !tx_pool->tx_buff)
 		return;
 
 	tx_entries = tx_pool->num_buffers;