From: Christoph Hellwig <hch@lst.de>
Date: Wed, 3 Jun 2020 05:52:34 +0000 (+0200)
Subject: net/sysctl: use cpumask_parse in flow_limit_cpu_sysctl
X-Git-Tag: v5.8-rc1~55^2~5
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=56965ac7253ece22050cf31ea5d1558e4c49cff2;p=thirdparty%2Flinux.git

net/sysctl: use cpumask_parse in flow_limit_cpu_sysctl

cpumask_parse_user works on __user pointers, so this is wrong now.

Fixes: 32927393dc1c ("sysctl: pass kernel pointers to ->proc_handler")
Reported-by: build test robot <lkp@intel.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---

diff --git a/net/core/sysctl_net_core.c b/net/core/sysctl_net_core.c
index 0ddb13a6282b0..d14d049af52ae 100644
--- a/net/core/sysctl_net_core.c
+++ b/net/core/sysctl_net_core.c
@@ -126,7 +126,7 @@ static int flow_limit_cpu_sysctl(struct ctl_table *table, int write,
 		return -ENOMEM;
 
 	if (write) {
-		ret = cpumask_parse_user(buffer, *lenp, mask);
+		ret = cpumask_parse(buffer, mask);
 		if (ret)
 			goto done;