linux-kernel - [PATCH] mailbox: pcc: Fix an invalid-load caught by the address sanitizer

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Date:   Mon, 9 May 2022 09:17:16 -0500
From:   Mario Limonciello <mario.limonciello@....com>
To:     <mario.limonciello@....com>, Sudeep Holla <sudeep.holla@....com>,
        "Jassi Brar" <jassisinghbrar@...il.com>,
        "open list:ACPI PCC(Platform Communication Channel) MAILBO..." 
        <linux-acpi@...r.kernel.org>,
        "open list:MAILBOX API" <linux-kernel@...r.kernel.org>
Subject: [PATCH] mailbox: pcc: Fix an invalid-load caught by the address sanitizer

`pcc_mailbox_probe` doesn't initialize all memory that has been allocated
before the first time that one of it's members `txdone_irq` may be
accessed.

This leads to a an invalid load any time that this member is accessed:
[    2.429769] UBSAN: invalid-load in drivers/mailbox/pcc.c:684:22
[    2.430324] UBSAN: invalid-load in drivers/mailbox/mailbox.c:486:12
[    4.276782] UBSAN: invalid-load in drivers/acpi/cppc_acpi.c:314:45

Link: https://bugzilla.kernel.org/show_bug.cgi?id=215587
Fixes: ce028702ddbc ("mailbox: pcc: Move bulk of PCCT parsing into pcc_mbox_probe")
Signed-off-by: Mario Limonciello <mario.limonciello@....com>
---
 drivers/mailbox/pcc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mailbox/pcc.c b/drivers/mailbox/pcc.c
index ed18936b8ce6..ebfa33a40fce 100644
--- a/drivers/mailbox/pcc.c
+++ b/drivers/mailbox/pcc.c
@@ -654,7 +654,7 @@ static int pcc_mbox_probe(struct platform_device *pdev)
 		goto err;
 	}
 
-	pcc_mbox_ctrl = devm_kmalloc(dev, sizeof(*pcc_mbox_ctrl), GFP_KERNEL);
+	pcc_mbox_ctrl = devm_kzalloc(dev, sizeof(*pcc_mbox_ctrl), GFP_KERNEL);
 	if (!pcc_mbox_ctrl) {
 		rc = -ENOMEM;
 		goto err;
-- 
2.25.1