linux-kernel - [PATCH] net: wireless: fix missing checks for ioremap

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Date:   Mon, 11 Mar 2019 02:54:40 -0500
From:   Kangjie Lu <kjlu@....edu>
To:     kjlu@....edu
Cc:     pakki001@....edu, Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] net: wireless: fix missing checks for ioremap

ioremap could fail and returns NULL. The fix actively checks
its return value and handles potential failures.

Signed-off-by: Kangjie Lu <kjlu@....edu>
---
 drivers/net/wireless/ray_cs.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/net/wireless/ray_cs.c b/drivers/net/wireless/ray_cs.c
index 44a943d18b84..cecd18a2f2de 100644
--- a/drivers/net/wireless/ray_cs.c
+++ b/drivers/net/wireless/ray_cs.c
@@ -394,6 +394,10 @@ static int ray_config(struct pcmcia_device *link)
 		goto failed;
 	local->sram = ioremap(link->resource[2]->start,
 			resource_size(link->resource[2]));
+	if (!local->sram) {
+		ret = -ENOMEM;
+		goto failed;
+	}
 
 /*** Set up 16k window for shared memory (receive buffer) ***************/
 	link->resource[3]->flags |=
@@ -408,6 +412,10 @@ static int ray_config(struct pcmcia_device *link)
 		goto failed;
 	local->rmem = ioremap(link->resource[3]->start,
 			resource_size(link->resource[3]));
+	if (!local->rmem) {
+		ret = -ENOMEM;
+		goto failed;
+	}
 
 /*** Set up window for attribute memory ***********************************/
 	link->resource[4]->flags |=
@@ -422,6 +430,10 @@ static int ray_config(struct pcmcia_device *link)
 		goto failed;
 	local->amem = ioremap(link->resource[4]->start,
 			resource_size(link->resource[4]));
+	if (!local->amem) {
+		ret = -ENOMEM;
+		goto failed;
+	}
 
 	dev_dbg(&link->dev, "ray_config sram=%p\n", local->sram);
 	dev_dbg(&link->dev, "ray_config rmem=%p\n", local->rmem);
-- 
2.17.1