Commit e0a04cff authored by Nick Piggin's avatar Nick Piggin Committed by Linus Torvalds
Browse files

[PATCH] mincore: vma crossing fix 



My mincore also forgot about crossing vmas.

Signed-off-by: default avatarNick Piggin <npiggin@suse.de>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 4a76ef03

mm/mincore.c

+10 −2
Original line number Diff line number Diff line
@@ -77,8 +77,16 @@ static long do_mincore(unsigned long addr, unsigned char *vec, unsigned long pag 
	 * PTE array for our address.

	 */

	nr = PTRS_PER_PTE - ((addr >> PAGE_SHIFT) & (PTRS_PER_PTE-1));

	if (nr > pages)

		nr = pages;



	/*

	 * Don't overrun this vma

	 */

	nr = min(nr, (vma->vm_end - addr) >> PAGE_SHIFT);



	/*

	 * Don't return more than the caller asked for

	 */

	nr = min(nr, pages);



	pgd = pgd_offset(vma->vm_mm, addr);

	if (pgd_none_or_clear_bad(pgd))

CRA Git | Maintained and supported by SUSTech CRA and CCSE