linux-kernel - Re: [syzbot] [trace?] WARNING in bitmap_parse

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Message-ID: <tencent_ADCFBC7BBA6D582D356CE49658E91EED2A0A@qq.com>
Date: Mon, 16 Dec 2024 20:28:58 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+0aecfd34fb878546f3fd@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [trace?] WARNING in bitmap_parse_user

#syz test

diff --git a/mm/util.c b/mm/util.c
index c1c3b06ab4f9..1845d649b171 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -302,7 +302,7 @@ void *memdup_user_nul(const void __user *src, size_t len)
 	 * cause pagefault, which makes it pointless to use GFP_NOFS
 	 * or GFP_ATOMIC.
 	 */
-	p = kmalloc_track_caller(len + 1, GFP_KERNEL);
+	p = kmalloc_track_caller(len + 1, GFP_KERNEL | __GFP_NOWARN);
 	if (!p)
 		return ERR_PTR(-ENOMEM);