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>
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@ -137,9 +137,9 @@ static int __init mtk_sysirq_of_init(struct device_node *node,
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return -ENOMEM;
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chip_data->intpol_base = of_io_request_and_map(node, 0, "intpol");
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if (!chip_data->intpol_base) {
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if (IS_ERR(chip_data->intpol_base)) {
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pr_err("mtk_sysirq: unable to map sysirq register\n");
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ret = -ENOMEM;
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ret = PTR_ERR(chip_data->intpol_base);
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goto out_free;
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}
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