From: Hillf Danton <hdanton@sina.com>
To: syzbot <syzbot+6c1861115b4253e45969@syzkaller.appspotmail.com>
Cc: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com
Subject: Re: [syzbot] [kernel?] KASAN: slab-use-after-free Read in futex_unqueue
Date: Wed, 11 Feb 2026 06:51:20 +0800 [thread overview]
Message-ID: <20260210225152.2795-1-hdanton@sina.com> (raw)
In-Reply-To: <698ba684.a70a0220.2c38d7.007c.GAE@google.com>
> Date: Tue, 10 Feb 2026 13:43:32 -0800 [thread overview]
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: 72c395024dac Merge tag 'docs-7.0' of git://git.kernel.org/..
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=137d9b22580000
> kernel config: https://syzkaller.appspot.com/x/.config?x=bf83be18dae53c93
> dashboard link: https://syzkaller.appspot.com/bug?extid=6c1861115b4253e45969
> compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=169f8ae6580000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17f657fa580000
#syz test
--- x/kernel/futex/core.c
+++ y/kernel/futex/core.c
@@ -1735,8 +1735,7 @@ void futex_hash_free(struct mm_struct *m
free_percpu(mm->futex_ref);
kvfree(mm->futex_phash_new);
fph = rcu_dereference_raw(mm->futex_phash);
- if (fph)
- kvfree(fph);
+ kvfree_rcu(fph, rcu);
}
static bool futex_pivot_pending(struct mm_struct *mm)
--
next prev parent reply other threads:[~2026-02-10 22:52 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-10 21:43 syzbot
2026-02-10 22:51 ` Hillf Danton [this message]
2026-02-10 23:15 ` syzbot
2026-02-11 0:38 ` Hillf Danton
2026-02-11 0:55 ` syzbot
2026-02-11 3:31 ` Forwarded: [PATCH] futex: Fix use-after-free in futex_unqueue() on private hash teardown syzbot
2026-02-11 8:14 ` Thomas Gleixner
2026-02-11 6:31 ` [syzbot] [kernel?] KASAN: slab-use-after-free Read in futex_unqueue Hillf Danton
2026-02-11 6:55 ` syzbot
2026-02-11 9:22 ` Hillf Danton
2026-02-11 9:46 ` syzbot
[not found] <20260211033121.713551-1-suunj1331@gmail.com>
2026-02-11 3:49 ` syzbot
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