linux-kernel - [PATCH -next 2/3] xen: balloon: Replaced simple

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Date:   Wed, 26 May 2021 09:20:19 +0000
From:   Chen Huang <chenhuang5@...wei.com>
To:     Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        "Boris Ostrovsky" <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Mark Fasheh <mark@...heh.com>,
        Joel Becker <jlbec@...lplan.org>,
        Joseph Qi <joseph.qi@...ux.alibaba.com>,
        Nathan Lynch <nathanl@...ux.ibm.com>,
        Andrew Donnellan <ajd@...ux.ibm.com>,
        Alexey Kardashevskiy <aik@...abs.ru>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        "Jens Axboe" <axboe@...nel.dk>,
        Yang Yingliang <yangyingliang@...wei.com>,
        "Masahiro Yamada" <masahiroy@...nel.org>,
        Dan Carpenter <dan.carpenter@...cle.com>
CC:     <linuxppc-dev@...ts.ozlabs.org>, <linux-kernel@...r.kernel.org>,
        <xen-devel@...ts.xenproject.org>, <ocfs2-devel@....oracle.com>,
        Chen Huang <chenhuang5@...wei.com>
Subject: [PATCH -next 2/3] xen: balloon: Replaced simple_strtoull() with kstrtoull()

The simple_strtoull() function is deprecated in some situation, since
it does not check for the range overflow, use kstrtoull() instead.

Signed-off-by: Chen Huang <chenhuang5@...wei.com>
---
 drivers/xen/xen-balloon.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/xen/xen-balloon.c b/drivers/xen/xen-balloon.c
index a8d24433c8e9..1fba838963d2 100644
--- a/drivers/xen/xen-balloon.c
+++ b/drivers/xen/xen-balloon.c
@@ -163,13 +163,16 @@ static ssize_t store_target_kb(struct device *dev,
 			       const char *buf,
 			       size_t count)
 {
-	char *endchar;
+	ssize_t ret;
 	unsigned long long target_bytes;
 
 	if (!capable(CAP_SYS_ADMIN))
 		return -EPERM;
 
-	target_bytes = simple_strtoull(buf, &endchar, 0) * 1024;
+	ret = kstrtoull(buf, 0, &target_bytes);
+	if (ret)
+		return ret;
+	target_bytes *= 1024;
 
 	balloon_set_new_target(target_bytes >> PAGE_SHIFT);
 
-- 
2.25.1