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authorYingjoe Chen <yingjoe.chen@mediatek.com>2014-12-10 17:55:02 +0800
committerJason Cooper <jason@lakedaemon.net>2015-01-07 01:58:48 +0000
commit596c4051eb6b0c7f5fc5437c2269b7191b59ff3b (patch)
tree5efa63269e0793d23e72594a279991cf0fff466f /drivers/irqchip
parent97bf6af1f928216fd6c5a66e8a57bfa95a659672 (diff)
irqchip: mtk-sysirq: Use IS_ERR() instead of NULL pointer check
Beniamino noticed a bug that an invalid DT file for the mediatek interrupt polarity extension will cause kernel oops. The reason is that the interrupt polarity support for mediatek chips merely checks for NULL pointer instead of a casted error return value in mtk_sysirq_of_init() so any other casted error value passes the NULL pointer check and causes a kernel panic when dereferenced. Use IS_ERR() and return the error value via PTR_ERR(). [ jac: took V2 over V3 for diff formatting, hand-added V3 changes, tweaked subject line. ] Reported-by: Beniamino Galvani <b.galvani@gmail.com> Signed-off-by: Yingjoe Chen <yingjoe.chen@mediatek.com> Link: https://lkml.kernel.org/r/1418205302-22531-1-git-send-email-yingjoe.chen@mediatek.com Signed-off-by: Jason Cooper <jason@lakedaemon.net>
Diffstat (limited to 'drivers/irqchip')
-rw-r--r--drivers/irqchip/irq-mtk-sysirq.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/irqchip/irq-mtk-sysirq.c b/drivers/irqchip/irq-mtk-sysirq.c
index 7e342df6a62f..0b0d2c00a2df 100644
--- a/drivers/irqchip/irq-mtk-sysirq.c
+++ b/drivers/irqchip/irq-mtk-sysirq.c
@@ -137,9 +137,9 @@ static int __init mtk_sysirq_of_init(struct device_node *node,
return -ENOMEM;
chip_data->intpol_base = of_io_request_and_map(node, 0, "intpol");
- if (!chip_data->intpol_base) {
+ if (IS_ERR(chip_data->intpol_base)) {
pr_err("mtk_sysirq: unable to map sysirq register\n");
- ret = -ENOMEM;
+ ret = PTR_ERR(chip_data->intpol_base);
goto out_free;
}