From: Mark Bloch <markb@mellanox.com>
Date: Thu, 27 Oct 2016 13:36:31 +0000 (+0300)
Subject: IB/core: Avoid unsigned int overflow in sg_alloc_table
X-Git-Tag: submit/tizen/20161219.112149~6^2~4
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=eba83a85cabaaee02b25edfa19f85c4de73a5165;p=sdk%2Femulator%2Femulator-kernel.git

IB/core: Avoid unsigned int overflow in sg_alloc_table

commit 3c7ba5760ab8eedec01159b267bb9bfcffe522ac upstream.

sg_alloc_table gets unsigned int as parameter while the driver
returns it as size_t. Check npages isn't greater than maximum
unsigned int.

Fixes: eeb8461e36c9 ("IB: Refactor umem to use linear SG table")
Signed-off-by: Mark Bloch <markb@mellanox.com>
Signed-off-by: Maor Gottlieb <maorg@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/infiniband/core/umem.c b/drivers/infiniband/core/umem.c
index 38acb3cfc545..04f3c0db9126 100644
--- a/drivers/infiniband/core/umem.c
+++ b/drivers/infiniband/core/umem.c
@@ -175,7 +175,7 @@ struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr,
 
 	cur_base = addr & PAGE_MASK;
 
-	if (npages == 0) {
+	if (npages == 0 || npages > UINT_MAX) {
 		ret = -EINVAL;
 		goto out;
 	}