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(parent: 01997bb) | patch
s390/gup: handle zero nr_pages case correctly
authorHeiko Carstens <heiko.carstens@de.ibm.com>
Tue, 8 Oct 2013 07:29:09 +0000 (09:29 +0200)
committerMartin Schwidefsky <schwidefsky@de.ibm.com>
Thu, 24 Oct 2013 15:17:01 +0000 (17:17 +0200)
commiteb0bf929d5228ca0eb2758585f2e4e25aa20427e
tree68b30c431a0418d31feaca8046a9deab86172b7etree | snapshot
parent01997bbc924d63e6c4837c5d8dc190245bc473eccommit | diff
s390/gup: handle zero nr_pages case correctly

If [__]get_user_pages_fast() gets called with nr_pages == 0, the current
code would walk the page tables and pin as many pages until the first
invalid pte (or the kernel crashed while writing struct page pointers to
the pages array).
So let's handle at least the nr_pages == 0 case correctly and exit early.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
arch/s390/mm/gup.c diff | blob | history
ep93xx device tree rework repo: git://git.maquefel.me/linux.git