[PATCH 4.5 083/238] crypto: ux500 - fix checks of error code returned by devm_ioremap_resource()

From: Greg Kroah-Hartman
Date: Sun Apr 10 2016 - 14:46:19 EST


4.5-stable review patch. If anyone has any objections, please let me know.

------------------

From: Vladimir Zapolskiy <vz@xxxxxxxxx>

commit b62917a2622ebcb03a500ef20da47be80d8c8951 upstream.

The change fixes potential oops while accessing iomem on invalid
address, if devm_ioremap_resource() fails due to some reason.

The devm_ioremap_resource() function returns ERR_PTR() and never
returns NULL, which makes useless a following check for NULL.

Signed-off-by: Vladimir Zapolskiy <vz@xxxxxxxxx>
Fixes: 5a4eea2658c93 ("crypto: ux500 - Use devm_xxx() managed function")
Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
drivers/crypto/ux500/cryp/cryp_core.c | 4 ++--
drivers/crypto/ux500/hash/hash_core.c | 4 ++--
2 files changed, 4 insertions(+), 4 deletions(-)

--- a/drivers/crypto/ux500/cryp/cryp_core.c
+++ b/drivers/crypto/ux500/cryp/cryp_core.c
@@ -1440,9 +1440,9 @@ static int ux500_cryp_probe(struct platf

device_data->phybase = res->start;
device_data->base = devm_ioremap_resource(dev, res);
- if (!device_data->base) {
+ if (IS_ERR(device_data->base)) {
dev_err(dev, "[%s]: ioremap failed!", __func__);
- ret = -ENOMEM;
+ ret = PTR_ERR(device_data->base);
goto out;
}

--- a/drivers/crypto/ux500/hash/hash_core.c
+++ b/drivers/crypto/ux500/hash/hash_core.c
@@ -1659,9 +1659,9 @@ static int ux500_hash_probe(struct platf

device_data->phybase = res->start;
device_data->base = devm_ioremap_resource(dev, res);
- if (!device_data->base) {
+ if (IS_ERR(device_data->base)) {
dev_err(dev, "%s: ioremap() failed!\n", __func__);
- ret = -ENOMEM;
+ ret = PTR_ERR(device_data->base);
goto out;
}
spin_lock_init(&device_data->ctx_lock);