linux-kernel - [PATCH AUTOSEL 4.14 03/39] platform/x86: wmi: do not fail if disabling fails

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Message-Id: <20211109010649.1191041-3-sashal@kernel.org>
Date:   Mon,  8 Nov 2021 20:06:13 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Barnabás Pőcze <pobrn@...tonmail.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Sasha Levin <sashal@...nel.org>, markgross@...nel.org,
        platform-driver-x86@...r.kernel.org
Subject: [PATCH AUTOSEL 4.14 03/39] platform/x86: wmi: do not fail if disabling fails

From: Barnabás Pőcze <pobrn@...tonmail.com>

[ Upstream commit 1975718c488a39128f1f515b23ae61a5a214cc3d ]

Previously, `__query_block()` would fail if the
second WCxx method call failed. However, the
WQxx method might have succeeded, and potentially
allocated memory for the result. Instead of
throwing away the result and potentially
leaking memory, ignore the result of
the second WCxx call.

Signed-off-by: Barnabás Pőcze <pobrn@...tonmail.com>
Link: https://lore.kernel.org/r/20210904175450.156801-25-pobrn@protonmail.com
Reviewed-by: Hans de Goede <hdegoede@...hat.com>
Signed-off-by: Hans de Goede <hdegoede@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/platform/x86/wmi.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/platform/x86/wmi.c b/drivers/platform/x86/wmi.c
index a56e997816b23..07c1e0829b19a 100644
--- a/drivers/platform/x86/wmi.c
+++ b/drivers/platform/x86/wmi.c
@@ -307,7 +307,14 @@ static acpi_status __query_block(struct wmi_block *wblock, u8 instance,
 	 * the WQxx method failed - we should disable collection anyway.
 	 */
 	if ((block->flags & ACPI_WMI_EXPENSIVE) && ACPI_SUCCESS(wc_status)) {
-		status = acpi_execute_simple_method(handle, wc_method, 0);
+		/*
+		 * Ignore whether this WCxx call succeeds or not since
+		 * the previously executed WQxx method call might have
+		 * succeeded, and returning the failing status code
+		 * of this call would throw away the result of the WQxx
+		 * call, potentially leaking memory.
+		 */
+		acpi_execute_simple_method(handle, wc_method, 0);
 	}
 
 	return status;
-- 
2.33.0