linux-kernel - [PATCH 10/29] staging: lustre: libcfs: test if userland data is to small

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Message-Id: <1458687856-24959-11-git-send-email-jsimmons@infradead.org>
Date:	Tue, 22 Mar 2016 19:03:57 -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 10/29] staging: lustre: libcfs: test if userland data is to small

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

Ensure that user land data is at least the smallest size.

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>
---
 .../lustre/lnet/libcfs/linux/linux-module.c        |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/drivers/staging/lustre/lnet/libcfs/linux/linux-module.c b/drivers/staging/lustre/lnet/libcfs/linux/linux-module.c
index 35e2fcf..ae05895 100644
--- a/drivers/staging/lustre/lnet/libcfs/linux/linux-module.c
+++ b/drivers/staging/lustre/lnet/libcfs/linux/linux-module.c
@@ -73,6 +73,11 @@ int libcfs_ioctl_getdata(struct libcfs_ioctl_hdr **hdr_pp,
 		return -EINVAL;
 	}
 
+	if (hdr.ioc_len < sizeof(struct libcfs_ioctl_data)) {
+		CERROR("libcfs ioctl: user buffer too small for ioctl\n");
+		return -EINVAL;
+	}
+
 	if (hdr.ioc_len > LIBCFS_IOC_DATA_MAX) {
 		CERROR("libcfs ioctl: user buffer is too large %d/%d\n",
 		       hdr.ioc_len, LIBCFS_IOC_DATA_MAX);
-- 
1.7.1