linux-kernel - [PATCH] ACPI: Fix memory leak in acpi_bind

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Message-ID: <alpine.LNX.2.00.0811091436310.23308@swampdragon.chaosbits.net>
Date:	Sun, 9 Nov 2008 14:38:30 +0100 (CET)
From:	Jesper Juhl <jj@...osbits.net>
To:	linux-acpi@...r.kernel.org
cc:	linux-kernel@...r.kernel.org, Len Brown <lenb@...nel.org>
Subject: [PATCH] ACPI: Fix memory leak in acpi_bind_one()

Memory is allocated with kzalloc() and assigned to
'physical_node'. Then 'physical_node->node_id' is initialized with a
call to 'find_first_zero_bit()', if that results in a value greater
than ACPI_MAX_PHYSICAL_NODE we'll end up jumping to the 'err:' label
and there leave the function and let 'physical_node' go out of scope
and leak the memory we allocated.
This patch fixes the leak by simply freeing the unused/unneeded memory
pointed to by 'physical_node' just before we jump to 'err:'.

Signed-off-by: Jesper Juhl <jj@...osbits.net>
---
 drivers/acpi/glue.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/drivers/acpi/glue.c b/drivers/acpi/glue.c
index d1a2d74..0837308 100644
--- a/drivers/acpi/glue.c
+++ b/drivers/acpi/glue.c
@@ -159,6 +159,7 @@ static int acpi_bind_one(struct device *dev, acpi_handle handle)
 	if (physical_node->node_id >= ACPI_MAX_PHYSICAL_NODE) {
 		retval = -ENOSPC;
 		mutex_unlock(&acpi_dev->physical_node_lock);
+		kfree(physical_node);
 		goto err;
 	}
 
-- 
1.7.1


-- 
Jesper Juhl <jj@...osbits.net>       http://www.chaosbits.net/
Don't top-post http://www.catb.org/jargon/html/T/top-post.html
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