Commit 9b593cb2 authored by Liam R. Howlett's avatar Liam R. Howlett Committed by Linus Torvalds
Browse files

remap_file_pages: Use vma_lookup() instead of find_vma() 

Using vma_lookup() verifies the start address is contained in the found vma.
This results in easier to read code.

Link: https://lkml.kernel.org/r/20210817135234.1550204-1-Liam.Howlett@oracle.com


Signed-off-by: default avatarLiam R. Howlett <Liam.Howlett@Oracle.com>
Reviewed-by: default avatarDavid Hildenbrand <david@redhat.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 5b78ed24

mm/mmap.c

+1 −4
Original line number Diff line number Diff line
@@ -2994,14 +2994,11 @@ SYSCALL_DEFINE5(remap_file_pages, unsigned long, start, unsigned long, size, 
	if (mmap_write_lock_killable(mm))

		return -EINTR;



	vma = find_vma(mm, start);

	vma = vma_lookup(mm, start);



	if (!vma || !(vma->vm_flags & VM_SHARED))

		goto out;



	if (start < vma->vm_start)

		goto out;



	if (start + size > vma->vm_end) {

		struct vm_area_struct *next;