From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dan Carpenter Subject: [PATCH] IB/mlx4: Potential buffer overflow in _mlx4_set_path() Date: Tue, 5 Dec 2017 17:39:23 +0300 Message-ID: <20171205143923.26dqc3ekhbmtmsgt@mwanda> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline Sender: linux-rdma-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Yishai Hadas Cc: Doug Ledford , Jason Gunthorpe , linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, kernel-janitors-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: linux-rdma@vger.kernel.org Smatch complains about this code: drivers/infiniband/hw/mlx4/qp.c:1827 _mlx4_set_path() error: buffer overflow 'dev->dev->caps.gid_table_len' 3 <= 255 The mlx4_ib_gid_index_to_real_index() does check that "port" is within bounds, but we don't check the return value for errors. It seems simple enough to add a check for that. Signed-off-by: Dan Carpenter --- Static analysis. Not tested. diff --git a/drivers/infiniband/hw/mlx4/qp.c b/drivers/infiniband/hw/mlx4/qp.c index 013049bcdb53..817257f105aa 100644 --- a/drivers/infiniband/hw/mlx4/qp.c +++ b/drivers/infiniband/hw/mlx4/qp.c @@ -1824,6 +1824,8 @@ static int _mlx4_set_path(struct mlx4_ib_dev *dev, mlx4_ib_gid_index_to_real_index(dev, port, grh->sgid_index); + if (real_sgid_index < 0) + return real_sgid_index; if (real_sgid_index >= dev->dev->caps.gid_table_len[port]) { pr_err("sgid_index (%u) too large. max is %d\n", real_sgid_index, dev->dev->caps.gid_table_len[port] - 1); -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html