linux-kernel - [PATCH] staging/lustre: Use proper number of bytes in copy_from

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Message-Id: <1479707208-1241688-1-git-send-email-green@linuxhacker.ru>
Date:   Mon, 21 Nov 2016 00:46:48 -0500
From:   Oleg Drokin <green@...uxhacker.ru>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        devel@...verdev.osuosl.org,
        Andreas Dilger <andreas.dilger@...el.com>,
        James Simmons <jsimmons@...radead.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Lustre Development List <lustre-devel@...ts.lustre.org>,
        Jian Yu <jian.yu@...el.com>, Oleg Drokin <green@...uxhacker.ru>
Subject: [PATCH] staging/lustre: Use proper number of bytes in copy_from_user

From: Jian Yu <jian.yu@...el.com>

This patch removes the usage of MAX_STRING_SIZE from
copy_from_user() and just copies enough bytes to cover
count passed in.

Signed-off-by: Jian Yu <jian.yu@...el.com>
Reviewed-on: http://review.whamcloud.com/23462
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-8774
Reviewed-by: John L. Hammond <john.hammond@...el.com>
Signed-off-by: Oleg Drokin <green@...uxhacker.ru>
---
 drivers/staging/lustre/lustre/obdclass/lprocfs_status.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/lustre/lustre/obdclass/lprocfs_status.c b/drivers/staging/lustre/lustre/obdclass/lprocfs_status.c
index 8a2f02f3..db49992 100644
--- a/drivers/staging/lustre/lustre/obdclass/lprocfs_status.c
+++ b/drivers/staging/lustre/lustre/obdclass/lprocfs_status.c
@@ -400,10 +400,17 @@ int lprocfs_wr_uint(struct file *file, const char __user *buffer,
 	char dummy[MAX_STRING_SIZE + 1], *end;
 	unsigned long tmp;
 
-	dummy[MAX_STRING_SIZE] = '\0';
-	if (copy_from_user(dummy, buffer, MAX_STRING_SIZE))
+	if (count >= sizeof(dummy))
+		return -EINVAL;
+
+	if (count == 0)
+		return 0;
+
+	if (copy_from_user(dummy, buffer, count))
 		return -EFAULT;
 
+	dummy[count] = '\0';
+
 	tmp = simple_strtoul(dummy, &end, 0);
 	if (dummy == end)
 		return -EINVAL;
-- 
2.7.4