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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2010-09-24 14:13:57 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-09-24 14:13:57 -0700 |
| commit | e92b05dec8865619ea2608c5c11a54b01467482f (patch) | |
| tree | 8de4b388a3d70d068bf6ee0469a56987f68bef5e | |
| parent | d1f3e68efb4c98fa229b39ff09a8984ef16cafa4 (diff) | |
| download | op-kernel-dev-e92b05dec8865619ea2608c5c11a54b01467482f.zip op-kernel-dev-e92b05dec8865619ea2608c5c11a54b01467482f.tar.gz | |
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>
| -rw-r--r-- | mm/fremap.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/mm/fremap.c b/mm/fremap.c index 46f5dac..7b7f852 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. */ |
