linux-kernel - [PATCH] acpi: Fix memory leak on acpi_scan_init

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Date:	Wed, 15 May 2013 17:49:35 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	Len Brown <lenb@...nel.org>, "Rafael J. Wysocki" <rjw@...k.pl>
Cc:	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	Toshi Kani <toshi.kani@...com>,
	Larry Finger <Larry.Finger@...inger.net>
Subject: [PATCH] acpi: Fix memory leak on acpi_scan_init_hotplug() error path

Following commit 6b772e8f9 (ACPI: Update PNPID match handling for
notify), the acpi_scan_init_hotplug() calls acpi_set_pnp_ids() which
allocates acpi_hardware_id and copies a few strings (kstrdup). If the
devices does not have hardware_id set, the function exits without
freeing the previously allocated ids (and kmemleak complains). This
patch calls simply changes 'return' on error to a 'goto out' which calls
acpi_free_pnp_ids().

Signed-off-by: Catalin Marinas <catalin.marinas@....com>
Reported-by: Larry Finger <Larry.Finger@...inger.net>
Cc: Toshi Kani <toshi.kani@...com>
---
 drivers/acpi/scan.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index fe158fd..c1bc608 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -1785,7 +1785,7 @@ static void acpi_scan_init_hotplug(acpi_handle handle, int type)
 	acpi_set_pnp_ids(handle, &pnp, type);
 
 	if (!pnp.type.hardware_id)
-		return;
+		goto out;
 
 	/*
 	 * This relies on the fact that acpi_install_notify_handler() will not
@@ -1800,6 +1800,7 @@ static void acpi_scan_init_hotplug(acpi_handle handle, int type)
 		}
 	}
 
+out:
 	acpi_free_pnp_ids(&pnp);
 }
 
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