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remap_file_pages: Use vma_lookup() instead of find_vma()

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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: Liam R. Howlett <Liam.Howlett@Oracle.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Liam R. Howlett 2021-09-02 14:56:49 -07:00 committed by Linus Torvalds
parent 5b78ed24e8
commit 9b593cb202
1 changed files with 1 additions and 4 deletions
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5
mm/mmap.c
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@ -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;