From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from r3-11.sinamail.sina.com.cn (r3-11.sinamail.sina.com.cn [202.108.3.11]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8D6759460 for ; Tue, 26 Aug 2025 07:32:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=202.108.3.11 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756193529; cv=none; b=Y9jieb+hOLLqSDHMGQ5615de4wKuDXXkq3tweFPA5YtmYEog+cTDUMyAozt1liWOA9n7W4FQZOA21bnTJBZzg+Jl7MwPLO9aK7RtFuCClsARH4seth1B+3K2UUtYYOK5KF5nVPOVCGTMgOjH3gioAhOkNnwxb/RLmQH0rMF2h5A= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756193529; c=relaxed/simple; bh=MhYvDM59kVtwBcKyly+o1hWGzVvcOwVourwoGiwe4+c=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=PFAceVlSLQtWvcwMDQl3ddGgUj84qUYE0QkZnjPWCtEcqcENRTObEB8LAexk3jb48pPnqRAJOUx3M11c4tz/8B/DBerz6l8Bg/EW/MTiSZfUJPdvm6mbW1cED21FxmVzfa++kNJveeyVpBuvYsbhdU2iJx7xvRTL8t5V1+/5Gkk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=sina.com; spf=pass smtp.mailfrom=sina.com; dkim=pass (1024-bit key) header.d=sina.com header.i=@sina.com header.b=fEX+twPH; arc=none smtp.client-ip=202.108.3.11 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=sina.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=sina.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=sina.com header.i=@sina.com header.b="fEX+twPH" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sina.com; s=201208; t=1756193523; bh=DVNNUJi/bngRL8Ee9uGfpw3GPY0lyCC5ZlN38bY3/Qw=; h=From:Subject:Date:Message-ID; b=fEX+twPHULegua3sBh352CSoqA9G4Di9fSu95Xh6KNa0hi2qKleMQvQQvfgUuRT/B OWQK5c0ooQXqVtAociS7nVjFJ7bmuMjB6KcVxgUFUiHz56bZ14sqPYi8OIj0Uu2v+6 KpttCTgW91nbqiRlDh9a93m1a/hYy6NvSHaJaIsc= X-SMAIL-HELO: localhost.localdomain Received: from unknown (HELO localhost.localdomain)([114.249.58.236]) by sina.com (10.54.253.34) with ESMTP id 68AD62EE00005499; Tue, 26 Aug 2025 15:32:00 +0800 (CST) X-Sender: hdanton@sina.com X-Auth-ID: hdanton@sina.com Authentication-Results: sina.com; spf=none smtp.mailfrom=hdanton@sina.com; dkim=none header.i=none; dmarc=none action=none header.from=hdanton@sina.com X-SMAIL-MID: 6101416291986 X-SMAIL-UIID: 5B23880CDFD7400B8BA19EA4864FECC9-20250826-153200-1 From: Hillf Danton To: syzbot Cc: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Subject: Re: [syzbot] [net?] KASAN: slab-use-after-free Write in __xfrm_state_delete Date: Tue, 26 Aug 2025 15:31:47 +0800 Message-ID: <20250826073149.5659-1-hdanton@sina.com> In-Reply-To: <68ab6633.050a0220.37038e.0079.GAE@google.com> References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit > Date: Sun, 24 Aug 2025 12:21:23 -0700 [thread overview] > syzbot has found a reproducer for the following issue on: > > HEAD commit: b1c92cdf5af3 Merge branch 'net-wangxun-complete-ethtool-co.. > git tree: net-next > console output: https://syzkaller.appspot.com/x/log.txt?x=1411b062580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=67b99ceb67d33475 > dashboard link: https://syzkaller.appspot.com/bug?extid=a25ee9d20d31e483ba7b > compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14221862580000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=159fba34580000 #syz test --- x/net/xfrm/xfrm_state.c +++ y/net/xfrm/xfrm_state.c @@ -618,6 +618,8 @@ static void xfrm_state_gc_destroy(struct xfrm_state_free(x); } +static DEFINE_MUTEX(notify_mutex); + static void xfrm_state_gc_task(struct work_struct *work) { struct xfrm_state *x; @@ -630,8 +632,10 @@ static void xfrm_state_gc_task(struct wo synchronize_rcu(); + mutex_lock(¬ify_mutex); hlist_for_each_entry_safe(x, tmp, &gc_list, gclist) xfrm_state_gc_destroy(x); + mutex_unlock(¬ify_mutex); } static enum hrtimer_restart xfrm_timer_handler(struct hrtimer *me) @@ -921,6 +925,7 @@ int xfrm_state_flush(struct net *net, u8 { int i, err = 0, cnt = 0; + mutex_lock(¬ify_mutex); spin_lock_bh(&net->xfrm.xfrm_state_lock); err = xfrm_state_flush_secctx_check(net, proto, task_valid); if (err) @@ -950,6 +955,7 @@ restart: } out: spin_unlock_bh(&net->xfrm.xfrm_state_lock); + mutex_unlock(¬ify_mutex); if (cnt) err = 0; --