linux-kernel - proc_dointvec() and write

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Date:	Mon, 24 May 2010 23:32:19 +0900
From:	"J. R. Okajima" <hooanon05@...oo.co.jp>
To:	amwang@...hat.com, opurdila@...acom.com, davem@...emloft.net
cc:	linux-kernel@...r.kernel.org
Subject: proc_dointvec() and write

The commit 00b7c3395aec3df43de5bd02a3c5a099ca51169f
"sysctl: refactor integer handling proc code"
modified the behaviour of writing to /proc.

Before the commit, write("1\n") to /proc/sys/kernel/printk succeeded. But
now it returns EINVAL. Is this intended change? If not, how about this
patch?

J. R. Okajima

diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 4c93486..5058e12 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -2262,6 +2272,8 @@ static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
 		if (write) {
 			left -= proc_skip_spaces(&kbuf);

+			if (!left)
+				break;
 			err = proc_get_long(&kbuf, &left, &lval, &neg,
 					     proc_wspace_sep,
 					     sizeof(proc_wspace_sep), NULL);
@@ -2288,7 +2306,7 @@ static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,

 	if (!write && !first && left && !err)
 		err = proc_put_char(&buffer, &left, '\n');
-	if (write && !err)
+	if (write && !err && left)
 		left -= proc_skip_spaces(&kbuf);
 free:
 	if (write) {

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