linux-kernel - Re: [syzbot] [perf?] WARNING in perf_event

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Date: Wed, 27 Dec 2023 10:27:05 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+3eff5e51bf1db122a16e@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [perf?] WARNING in perf_event_open

please test WARNING in perf_event_open

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git 39676dfe5233

diff --git a/mm/madvise.c b/mm/madvise.c
index 912155a94ed5..8fd3e00af243 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -1405,6 +1405,9 @@ int do_madvise(struct mm_struct *mm, unsigned long start, size_t len_in, int beh
 	if (!madvise_behavior_valid(behavior))
 		return -EINVAL;
 
+	if (!start)
+		return -EINVAL;
+
 	if (!PAGE_ALIGNED(start))
 		return -EINVAL;
 	len = PAGE_ALIGN(len_in);