linux-kernel - Re: [syzbot] [nilfs?] [mm?] KASAN: slab-use-after-free Read in lru_add

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Message-Id: <20240614104141.537-1-hdanton@sina.com>
Date: Fri, 14 Jun 2024 18:41:41 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+d79afb004be235636ee8@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [nilfs?] [mm?] KASAN: slab-use-after-free Read in lru_add_fn

On Tue, 11 Jun 2024 11:10:20 -0700
> syzbot has found a reproducer for the following issue on:
> 
> HEAD commit:    83a7eefedc9b Linux 6.10-rc3
> git tree:       upstream
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17c645e2980000

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git  master

--- x/mm/truncate.c
+++ y/mm/truncate.c
@@ -418,6 +418,9 @@ void truncate_inode_pages_range(struct a
 		truncate_folio_batch_exceptionals(mapping, &fbatch, indices);
 		folio_batch_release(&fbatch);
 	}
+
+	if (mapping_exiting(mapping))
+		lru_add_drain_all();
 }
 EXPORT_SYMBOL(truncate_inode_pages_range);
 
--