From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Wed, 4 Jul 2018 09:32:12 +0000 (+0300)
Subject: IB/core: type promotion bug in rdma_rw_init_one_mr()
X-Git-Tag: v4.19~309^2~214
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=c2d7c8ff89b22ddefb1ac2986c0d48444a667689;p=platform%2Fkernel%2Flinux-rpi.git

IB/core: type promotion bug in rdma_rw_init_one_mr()

"nents" is an unsigned int, so if ib_map_mr_sg() returns a negative
error code then it's type promoted to a high unsigned int which is
treated as success.

Fixes: a060b5629ab0 ("IB/core: generic RDMA READ/WRITE API")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
---

diff --git a/drivers/infiniband/core/rw.c b/drivers/infiniband/core/rw.c
index c8963e9..3ee0adf 100644
--- a/drivers/infiniband/core/rw.c
+++ b/drivers/infiniband/core/rw.c
@@ -87,7 +87,7 @@ static int rdma_rw_init_one_mr(struct ib_qp *qp, u8 port_num,
 	}
 
 	ret = ib_map_mr_sg(reg->mr, sg, nents, &offset, PAGE_SIZE);
-	if (ret < nents) {
+	if (ret < 0 || ret < nents) {
 		ib_mr_pool_put(qp, &qp->rdma_mrs, reg->mr);
 		return -EINVAL;
 	}