linux-kernel - [PATCH] resource: make sure requested range intersects root range

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Date:	Thu,  3 May 2012 11:40:57 +0300
From:	Octavian Purdila <octavian.purdila@...el.com>
To:	linux-kernel@...r.kernel.org
Cc:	linuxram@...ibm.com, bjorn.helgaas@...com,
	Octavian Purdila <octavian.purdila@...el.com>
Subject: [PATCH] resource: make sure requested range intersects root range

When the requested and root ranges do not intersect,
__reserve_region_with_split will eventually overflow the stack.

Signed-off-by: Octavian Purdila <octavian.purdila@...el.com>
---
 kernel/resource.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/kernel/resource.c b/kernel/resource.c
index 7e8ea66..1f8d698 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -789,7 +789,11 @@ void __init reserve_region_with_split(struct resource *root,
 		const char *name)
 {
 	write_lock(&resource_lock);
-	__reserve_region_with_split(root, start, end, name);
+	if (start > root->end || end < root->start)
+		printk(KERN_ERR "Requested range (0x%llx-0x%llx) not in root range (0x%llx-0x%llx)\n",
+		       start, end, root->start, root->end);
+	else
+		__reserve_region_with_split(root, start, end, name);
 	write_unlock(&resource_lock);
 }
 
-- 
1.7.5.4

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