From e92b05dec8865619ea2608c5c11a54b01467482f Mon Sep 17 00:00:00 2001
From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Fri, 24 Sep 2010 14:13:57 -0700
Subject: [PATCH] fremap: get rid of broken 'end' variable
Thomas Pollet points out that the 'end' variable is broken. It was
computed based on start/size before they were page-aligned, and as such
doesn't actually match any of the other actions we take. The overflow
test on end was also redundant, since we had already tested it with the
properly aligned version.
So just get rid of it entirely. The one remaining use for that broken
variable can just use 'start+size' like all the other cases already did.
Reported-by: Thomas Pollet <thomas.pollet@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
mm/fremap.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/mm/fremap.c b/mm/fremap.c
index 46f5dacf90a2..7b7f852848de 100644
--- a/mm/fremap.c
+++ b/mm/fremap.c
@@ -125,7 +125,6 @@ SYSCALL_DEFINE5(remap_file_pages, unsigned long, start, unsigned long, size,
{
struct mm_struct *mm = current->mm;
struct address_space *mapping;
- unsigned long end = start + size;
struct vm_area_struct *vma;
int err = -EINVAL;
int has_write_lock = 0;
@@ -168,7 +167,7 @@ SYSCALL_DEFINE5(remap_file_pages, unsigned long, start, unsigned long, size,
if (!(vma->vm_flags & VM_CAN_NONLINEAR))
goto out;
- if (end <= start || start < vma->vm_start || end > vma->vm_end)
+ if (start < vma->vm_start || start + size > vma->vm_end)
goto out;
/* Must set VM_NONLINEAR before any pages are populated. */
--
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