Commit 5aaf07f0 authored by Liam Howlett's avatar Liam Howlett Committed by Linus Torvalds
Browse files

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

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: default avatarLiam R. Howlett <Liam.Howlett@Oracle.com>
Reviewed-by: default avatarLaurent Dufour <ldufour@linux.ibm.com>
Acked-by: default avatarDavid Hildenbrand <david@redhat.com>
Acked-by: default avatarDavidlohr Bueso <dbueso@suse.de>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 059b8b48

mm/mremap.c

+3 −2
Original line number Diff line number Diff line
@@ -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);



	/*