linux-kernel - [PATCH] arm: fix incorrect bounds check

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Message-ID: <56988668.1040803@nextfour.com>
Date:	Fri, 15 Jan 2016 07:40:56 +0200
From:	Mika Penttilä <mika.penttila@...tfour.com>
To:	LKML <linux-kernel@...r.kernel.org>
CC:	<linux@....linux.org.uk>
Subject: [PATCH] arm: fix incorrect bounds check

Recent changes (4.4.0+) in module loader triggered oops on ARM. While
investigating it found incorrect bounds check. This was not the cause of
the oops but incorrect anyway.

--Mika

Signed-off-by: mika.penttila@...tfour.com
---

diff --git a/arch/arm/mm/pageattr.c b/arch/arm/mm/pageattr.c
index cf30daf..be7fe4b 100644
--- a/arch/arm/mm/pageattr.c
+++ b/arch/arm/mm/pageattr.c
@@ -52,7 +52,7 @@ static int change_memory_common(unsigned long addr,
int numpages,
        if (start < MODULES_VADDR || start >= MODULES_END)
                return -EINVAL;

-       if (end < MODULES_VADDR || start >= MODULES_END)
+       if (end < MODULES_VADDR || end >= MODULES_END)
                return -EINVAL;

        data.set_mask = set_mask;