From ec95e0fa21628ed25f12187fb1067b8b10ad7c9a Mon Sep 17 00:00:00 2001
From: Davidlohr Bueso <dave@stgolabs.net>
Date: Sat, 16 Feb 2019 04:15:52 -0800
Subject: [PATCH] drivers/IB,qib: Fix pinned/locked limit check in
qib_get_user_pages()
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>
---
drivers/infiniband/hw/qib/qib_user_pages.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/infiniband/hw/qib/qib_user_pages.c b/drivers/infiniband/hw/qib/qib_user_pages.c
index ef8bcf366ddca..123ca8f64f75d 100644
--- a/drivers/infiniband/hw/qib/qib_user_pages.c
+++ b/drivers/infiniband/hw/qib/qib_user_pages.c
@@ -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, ¤t->mm->pinned_vm);
- if (num_pages > lock_limit && !capable(CAP_IPC_LOCK)) {
+ if (locked > lock_limit && !capable(CAP_IPC_LOCK)) {
ret = -ENOMEM;
goto bail;
}
--
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