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Subject[PATCH 4.19 229/276] tty: ipwireless: fix missing checks for ioremap
Date
[ Upstream commit 1bbb1c318cd8a3a39e8c3e2e83d5e90542d6c3e3 ]

ipw->attr_memory and ipw->common_memory are assigned with the
return value of ioremap. ioremap may fail, but no checks
are enforced. The fix inserts the checks to avoid potential
NULL pointer dereferences.

Signed-off-by: Kangjie Lu <kjlu@umn.edu>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
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 3475e841ef5c1..4c18bbfe1a92e 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)) {
--
2.20.1


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