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mm/mremap: use vma_lookup() in vma_to_resize()

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Use vma_lookup() to find the VMA at a specific address.  As vma_lookup()
will return NULL if the address is not within any VMA, the start address
no longer needs to be validated.

Link: https://lkml.kernel.org/r/20210521174745.2219620-21-Liam.Howlett@Oracle.com
Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
Reviewed-by: Laurent Dufour <ldufour@linux.ibm.com>
Acked-by: David Hildenbrand <david@redhat.com>
Acked-by: Davidlohr Bueso <dbueso@suse.de>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Liam Howlett 2021-06-28 19:39:47 -07:00 committed by Linus Torvalds
parent 059b8b4875
commit 5aaf07f081
1 changed files with 3 additions and 2 deletions
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5
mm/mremap.c
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@ -634,10 +634,11 @@ static struct vm_area_struct *vma_to_resize(unsigned long addr,
unsigned long *p)
{
struct mm_struct *mm = current->mm;
struct vm_area_struct *vma = find_vma(mm, addr);
struct vm_area_struct *vma;
unsigned long pgoff;
if (!vma || vma->vm_start > addr)
vma = vma_lookup(mm, addr);
if (!vma)
return ERR_PTR(-EFAULT);
/*