linux-kernel - [PATCH] acpica: Fix double-free in acpi_ns_repair

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Message-Id: <20170203205654.28269-1-jprvita@endlessm.com>
Date:   Fri,  3 Feb 2017 15:56:54 -0500
From:   "João Paulo Rechi Vita" <jprvita@...il.com>
To:     Robert Moore <robert.moore@...el.com>,
        Lv Zheng <lv.zheng@...el.com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Len Brown <lenb@...nel.org>, Lin Ming <ming.m.lin@...el.com>
Cc:     linux-acpi@...r.kernel.org, devel@...ica.org,
        linux-kernel@...r.kernel.org, Daniel Drake <drake@...lessm.com>,
        linux@...lessm.com,
        João Paulo Rechi Vita <jprvita@...lessm.com>
Subject: [PATCH] acpica: Fix double-free in acpi_ns_repair_CID()

When acpi_ns_repair_CID() is called for a _CID which returns a package
of strings, it calls acpi_ns_repair_HID() for each of the package
elements.  acpi_ns_repair_HID() calls acpi_ut_remove_reference() on the
original object, but acpi_ns_repair_CID() calls it again on return,
leading to a double free.

This problem was seen on a Acer TravelMate P449-G2-MG.

Thanks to Daniel Drake for helping investigating this problem.

Signed-off-by: João Paulo Rechi Vita <jprvita@...lessm.com>
---
 drivers/acpi/acpica/nsrepair2.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/acpi/acpica/nsrepair2.c b/drivers/acpi/acpica/nsrepair2.c
index d5336122486b..c429c8eca476 100644
--- a/drivers/acpi/acpica/nsrepair2.c
+++ b/drivers/acpi/acpica/nsrepair2.c
@@ -411,8 +411,6 @@ acpi_ns_repair_CID(struct acpi_evaluate_info *info,
 
 			(*element_ptr)->common.reference_count =
 			    original_ref_count;
-
-			acpi_ut_remove_reference(original_element);
 		}
 
 		element_ptr++;
-- 
2.11.0