linux-kernel - [PATCH] kallsyms: fix potential overflow in binary search

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Message-ID: <20080513200736.GA17909@damson.getinternet.no>
Date:	Tue, 13 May 2008 22:07:36 +0200
From:	Vegard Nossum <vegard.nossum@...il.com>
To:	akpm@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] kallsyms: fix potential overflow in binary search

>From 61b840f071e496f632fcc293f5435428cfc98844 Mon Sep 17 00:00:00 2001
From: Vegard Nossum <vegard.nossum@...il.com>
Date: Tue, 13 May 2008 10:20:27 +0200
Subject: [PATCH] kallsyms: fix potential overflow in binary search

This will probably never trigger... but it won't hurt to be careful.

http://googleresearch.blogspot.com/2006/06/extra-extra-read-all-about-it-nearly.html

Signed-off-by: Vegard Nossum <vegard.nossum@...il.com>
---
 kernel/kallsyms.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/kallsyms.c b/kernel/kallsyms.c
index 6fc0040..38fc10a 100644
--- a/kernel/kallsyms.c
+++ b/kernel/kallsyms.c
@@ -176,7 +176,7 @@ static unsigned long get_symbol_pos(unsigned long addr,
 	high = kallsyms_num_syms;
 
 	while (high - low > 1) {
-		mid = (low + high) / 2;
+		mid = low + (high - low) / 2;
 		if (kallsyms_addresses[mid] <= addr)
 			low = mid;
 		else
-- 
1.5.4.1

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