linux-kernel - [PATCH] bus: hisi_lpc: Don't use devm_kzalloc() to allocate logical PIO range

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Date:   Fri, 14 Jun 2019 17:47:04 +0800
From:   John Garry <john.garry@...wei.com>
To:     <xuwei5@...wei.com>
CC:     <bhelgaas@...gle.com>, <linuxarm@...wei.com>, <arm@...nel.org>,
        <linux-kernel@...r.kernel.org>, John Garry <john.garry@...wei.com>
Subject: [PATCH] bus: hisi_lpc: Don't use devm_kzalloc() to allocate logical PIO range

If, after registering a logical PIO range, the driver probe later fails,
the logical PIO range memory will be released automatically.

This causes an issue, in that the logical PIO range is not unregistered
(that is not supported) and the released range memory may be later
referenced

Allocate the logical PIO range with kzalloc() to avoid this potential
issue.

Fixes: adf38bb0b5956 ("HISI LPC: Support the LPC host on Hip06/Hip07 with DT bindings")
Signed-off-by: John Garry <john.garry@...wei.com>

diff --git a/drivers/bus/hisi_lpc.c b/drivers/bus/hisi_lpc.c
index 19d7b6ff2f17..d9ab4e76010d 100644
--- a/drivers/bus/hisi_lpc.c
+++ b/drivers/bus/hisi_lpc.c
@@ -599,7 +599,7 @@ static int hisi_lpc_probe(struct platform_device *pdev)
 	if (IS_ERR(lpcdev->membase))
 		return PTR_ERR(lpcdev->membase);
 
-	range = devm_kzalloc(dev, sizeof(*range), GFP_KERNEL);
+	range = kzalloc(sizeof(*range), GFP_KERNEL);
 	if (!range)
 		return -ENOMEM;
 
@@ -610,6 +610,7 @@ static int hisi_lpc_probe(struct platform_device *pdev)
 	ret = logic_pio_register_range(range);
 	if (ret) {
 		dev_err(dev, "register IO range failed (%d)!\n", ret);
+		kfree(range);
 		return ret;
 	}
 	lpcdev->io_host = range;
-- 
2.17.1