linux-kernel - Re: patch idr-fix-a-critical-misallocation-bug.patch added to 2.6.32-stable tree

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Message-ID: <4B73C50B.5040303@kernel.org>
Date:	Thu, 11 Feb 2010 17:51:23 +0900
From:	Tejun Heo <tj@...nel.org>
To:	Stefan Lippers-Hollmann <s.L-H@....de>
CC:	Greg KH <gregkh@...e.de>, linux-kernel@...r.kernel.org,
	Eric Paris <eparis@...hat.com>, akpm@...ux-foundation.org,
	torvalds@...ux-foundation.org, stable@...nel.org
Subject: Re: patch idr-fix-a-critical-misallocation-bug.patch added to 2.6.32-stable
 tree

Hello,

Can you please test the following patch on top of the current
mainline?

Thanks.

diff --git a/lib/idr.c b/lib/idr.c
index 1cac726..0dc7822 100644
--- a/lib/idr.c
+++ b/lib/idr.c
@@ -156,10 +156,12 @@ static int sub_alloc(struct idr *idp, int *starting_id, struct idr_layer **pa)
 			id = (id | ((1 << (IDR_BITS * l)) - 1)) + 1;
 
 			/* if already at the top layer, we need to grow */
-			if (!(p = pa[l])) {
+			if (id >= 1 << (idp->layers * IDR_BITS)) {
 				*starting_id = id;
 				return IDR_NEED_TO_GROW;
 			}
+			p = pa[l];
+			BUG_ON(!p);
 
 			/* If we need to go up one layer, continue the
 			 * loop; otherwise, restart from the top.

-- 
tejun
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