linux-kernel - [PATCH] tty: ipwireless: fix missing checks for ioremap

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Date:   Thu, 14 Mar 2019 02:05:32 -0500
From:   Kangjie Lu <kjlu@....edu>
To:     kjlu@....edu
Cc:     pakki001@....edu, Jiri Kosina <jikos@...nel.org>,
        David Sterba <dsterba@...e.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>, linux-kernel@...r.kernel.org
Subject: [PATCH] tty: ipwireless: fix missing checks for ioremap

ipw->attr_memory and ipw->common_memory are assigned with the
 return value of ioremap. ioremap may fail, but not checks
are enforced. The fix insertss the checks.

Signed-off-by: Kangjie Lu <kjlu@....edu>
---
 drivers/tty/ipwireless/main.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/tty/ipwireless/main.c b/drivers/tty/ipwireless/main.c
index 3475e841ef5c..4c18bbfe1a92 100644
--- a/drivers/tty/ipwireless/main.c
+++ b/drivers/tty/ipwireless/main.c
@@ -114,6 +114,10 @@ static int ipwireless_probe(struct pcmcia_device *p_dev, void *priv_data)
 
 	ipw->common_memory = ioremap(p_dev->resource[2]->start,
 				resource_size(p_dev->resource[2]));
+	if (!ipw->common_memory) {
+		ret = -ENOMEM;
+		goto exit1;
+	}
 	if (!request_mem_region(p_dev->resource[2]->start,
 				resource_size(p_dev->resource[2]),
 				IPWIRELESS_PCCARD_NAME)) {
@@ -134,6 +138,10 @@ static int ipwireless_probe(struct pcmcia_device *p_dev, void *priv_data)
 
 	ipw->attr_memory = ioremap(p_dev->resource[3]->start,
 				resource_size(p_dev->resource[3]));
+	if (!ipw->attr_memory) {
+		ret = -ENOMEM;
+		goto exit3;
+	}
 	if (!request_mem_region(p_dev->resource[3]->start,
 				resource_size(p_dev->resource[3]),
 				IPWIRELESS_PCCARD_NAME)) {
-- 
2.17.1