linux-kernel - [PATCH v2] net: fujitsu: fix a potential NULL pointer dereference

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Date:   Tue, 12 Mar 2019 02:16:21 -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 v2] net: fujitsu: fix a potential NULL pointer dereference

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

Signed-off-by: Kangjie Lu <kjlu@....edu>
---
 drivers/net/ethernet/fujitsu/fmvj18x_cs.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/ethernet/fujitsu/fmvj18x_cs.c b/drivers/net/ethernet/fujitsu/fmvj18x_cs.c
index a69cd19a55ae..1eca0fdb9933 100644
--- a/drivers/net/ethernet/fujitsu/fmvj18x_cs.c
+++ b/drivers/net/ethernet/fujitsu/fmvj18x_cs.c
@@ -547,6 +547,11 @@ 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) {
+	    pcmcia_release_window(link, link->resource[2]);
+	    return -ENOMEM;
+    }
+
     pcmcia_map_mem_page(link, link->resource[2], 0);
 
     /*
-- 
2.17.1