linux-kernel - [PATCH 11/29] staging: lustre: lnet: make sure lnet data not greater than LIBCFS_IOC_DATA

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Date:	Tue, 22 Mar 2016 19:03:58 -0400
From:	James Simmons <jsimmons@...radead.org>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	devel@...verdev.osuosl.org,
	Andreas Dilger <andreas.dilger@...el.com>,
	Oleg Drokin <oleg.drokin@...el.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Lustre Development List <lustre-devel@...ts.lustre.org>,
	Liang Zhen <liang.zhen@...el.com>
Subject: [PATCH 11/29] staging: lustre: lnet: make sure lnet data not greater than LIBCFS_IOC_DATA_MAX

From: Liang Zhen <liang.zhen@...el.com>

Fail to compile if largest LNet user land data structures passed
to kernel are larger than LIBCFS_IOC_DATA_MAX

Signed-off-by: Liang Zhen <liang.zhen@...el.com>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-5435
Reviewed-on: http://review.whamcloud.com/11313
Reviewed-by: Bobi Jam <bobijam@...il.com>
Reviewed-by: Johann Lombardi <johann.lombardi@...el.com>
Reviewed-by: Oleg Drokin <oleg.drokin@...el.com>
---
 drivers/staging/lustre/lnet/lnet/api-ni.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/drivers/staging/lustre/lnet/lnet/api-ni.c b/drivers/staging/lustre/lnet/lnet/api-ni.c
index 8764755..f825784 100644
--- a/drivers/staging/lustre/lnet/lnet/api-ni.c
+++ b/drivers/staging/lustre/lnet/lnet/api-ni.c
@@ -1864,6 +1864,10 @@ LNetCtl(unsigned int cmd, void *arg)
 	int rc;
 	unsigned long secs_passed;
 
+	BUILD_BUG_ON(LIBCFS_IOC_DATA_MAX <
+		     sizeof(struct lnet_ioctl_net_config) +
+		     sizeof(struct lnet_ioctl_config_data));
+
 	switch (cmd) {
 	case IOC_LIBCFS_GET_NI:
 		rc = LNetGetId(data->ioc_count, &id);
-- 
1.7.1