netdev - [PATCH] net: fujitsu: fix a potential NULL pointer dereference

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Message-Id: <20190311061503.18181-1-kjlu@umn.edu>
Date:   Mon, 11 Mar 2019 01:15:01 -0500
From:   Kangjie Lu <kjlu@....edu>
To:     kjlu@....edu
Cc:     pakki001@....edu, "David S. Miller" <davem@...emloft.net>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] net: fujitsu: fix a potential NULL pointer dereference

In case ioremap fails, the fix returns -ENOMEM to avoid the
NULL pointer dereference.

Signed-off-by: Kangjie Lu <kjlu@....edu>
---
 drivers/net/ethernet/fujitsu/fmvj18x_cs.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/fujitsu/fmvj18x_cs.c b/drivers/net/ethernet/fujitsu/fmvj18x_cs.c
index a69cd19a55ae..5061ddf699a7 100644
--- a/drivers/net/ethernet/fujitsu/fmvj18x_cs.c
+++ b/drivers/net/ethernet/fujitsu/fmvj18x_cs.c
@@ -547,6 +547,9 @@ static int fmvj18x_get_hwinfo(struct pcmcia_device *link, u_char *node_id)
 	return -1;
 
     base = ioremap(link->resource[2]->start, resource_size(link->resource[2]));
+    if (!base)
+	    return -ENOMEM;
+
     pcmcia_map_mem_page(link, link->resource[2], 0);
 
     /*
-- 
2.17.1