From: Jeremy Fitzhardinge <jeremy@goop.org>
Date: Fri, 6 Mar 2009 18:09:26 +0000 (-0800)
Subject: x86-32: make sure virt_addr_valid() returns false for fixmap addresses
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=0feca851c1b3cb4ebfa3149144b3d5de0879ebaa;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

x86-32: make sure virt_addr_valid() returns false for fixmap addresses

I found that virt_addr_valid() was returning true for fixmap addresses.

I'm not sure whether pfn_valid() is supposed to include this test,
but there's no harm in being explicit.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: Jiri Slaby <jirislaby@gmail.com>
Cc: Yinghai Lu <yinghai@kernel.org>
LKML-Reference: <49B166D6.2080505@goop.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c
index 62773abdf088..62def5795730 100644
--- a/arch/x86/mm/ioremap.c
+++ b/arch/x86/mm/ioremap.c
@@ -87,6 +87,8 @@ bool __virt_addr_valid(unsigned long x)
 		return false;
 	if (__vmalloc_start_set && is_vmalloc_addr((void *) x))
 		return false;
+	if (x >= FIXADDR_START)
+		return false;
 	return pfn_valid((x - PAGE_OFFSET) >> PAGE_SHIFT);
 }
 EXPORT_SYMBOL(__virt_addr_valid);