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drivers/IB,qib: Fix pinned/locked limit check in qib_get_user_pages()

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The current check does not take into account the previous value of
pinned_vm; thus it is quite bogus as is. Fix this by checking the
new value after the (optimistic) atomic inc.

Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Davidlohr Bueso 2019-02-16 04:15:52 -08:00 committed by Jason Gunthorpe
parent d0e02bf6cd
commit ec95e0fa21
1 changed files with 1 additions and 1 deletions
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2
drivers/infiniband/hw/qib/qib_user_pages.c
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@ -107,7 +107,7 @@ int qib_get_user_pages(unsigned long start_page, size_t num_pages,
lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
locked = atomic64_add_return(num_pages, &current->mm->pinned_vm);
if (num_pages > lock_limit && !capable(CAP_IPC_LOCK)) {
if (locked > lock_limit && !capable(CAP_IPC_LOCK)) {
ret = -ENOMEM;
goto bail;
}