From: Yann Droneaud <ydroneaud@opteya.com>
Date: Wed, 11 Dec 2013 22:01:50 +0000 (+0100)
Subject: IB/uverbs: Set error code when fail to consume all flow_spec items
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=98a37510ec1452817600d8ea47cff1d9f8d9bec8;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git

IB/uverbs: Set error code when fail to consume all flow_spec items

If the flow_spec items parsed count does not match the number of items
declared in the flow_attr command, or if not all bytes are used for
flow_spec items (eg. trailing garbage), a log message is reported and
the function leave through the error path. Unfortunately the error
code is currently not set.

This patch set error code to -EINVAL in such cases, so that the error
is reported to userspace instead of silently fail.

Link: http://marc.info/?i=cover.1386798254.git.ydroneaud@opteya.com>
Signed-off-by: Yann Droneaud <ydroneaud@opteya.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
---

diff --git a/drivers/infiniband/core/uverbs_cmd.c b/drivers/infiniband/core/uverbs_cmd.c
index 4e8b15c50481..45fb80b876b0 100644
--- a/drivers/infiniband/core/uverbs_cmd.c
+++ b/drivers/infiniband/core/uverbs_cmd.c
@@ -2738,6 +2738,7 @@ int ib_uverbs_ex_create_flow(struct ib_uverbs_file *file,
 	if (cmd.flow_attr.size || (i != flow_attr->num_of_specs)) {
 		pr_warn("create flow failed, flow %d: %d bytes left from uverb cmd\n",
 			i, cmd.flow_attr.size);
+		err = -EINVAL;
 		goto err_free;
 	}
 	flow_id = ib_create_flow(qp, flow_attr, IB_FLOW_DOMAIN_USER);