From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail115-95.sinamail.sina.com.cn (mail115-95.sinamail.sina.com.cn [218.30.115.95]) (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 5767439FFB for ; Wed, 1 May 2024 08:48:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=218.30.115.95 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1714553338; cv=none; b=urb8OrlbK2JkPhEh15rvuKjAP64Twl8pUvnGAM3FALpEubV0ej4LX4Tx7XUtDqkrX0zlnXKFDxOrhcsEfsKVAfzLBEG870A9GrrwnGogiysAlleVRWW0FeopErY9fhUvC+RoeXS+mVDuV+2RzRYTPOCrMfEPajI66ZkBFktG/LA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1714553338; c=relaxed/simple; bh=p7x6vJ2NqYHM4U+gU+kkTRG+vJJvgqgZSUDT/soswVY=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=lRVvMigrB8h9G12N4DHihENS2KWBjQ6hwEwspzS8HznuH8sEuU7TGkO3bf0VI2e0WBC14LEOQbdgAeawETz7p8HjVXvdGnGkg2kQxOK6oGRHKMkOJyxYvdqnvb69Fz0fpBKPtt5CcDsx9jTm4RoCHA+XM3cbfiaOGYwHvMpqfzQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=sina.com; spf=pass smtp.mailfrom=sina.com; arc=none smtp.client-ip=218.30.115.95 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=sina.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=sina.com X-SMAIL-HELO: localhost.localdomain Received: from unknown (HELO localhost.localdomain)([116.24.11.115]) by sina.com (172.16.235.24) with ESMTP id 663201F0000011C8; Wed, 1 May 2024 16:48:50 +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: 99079545089343 X-SMAIL-UIID: 807D76E1FAEC407CB8B51EBC7BF65897-20240501-164850-1 From: Hillf Danton To: syzbot Cc: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Subject: Re: [syzbot] [bluetooth?] KASAN: slab-use-after-free Read in skb_release_head_state Date: Wed, 1 May 2024 16:48:53 +0800 Message-Id: <20240501084853.1748-1-hdanton@sina.com> In-Reply-To: <0000000000006c25b806175ccab3@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 On Tue, 30 Apr 2024 21:19:20 -0700 > syzbot has found a reproducer for the following issue on: > > HEAD commit: 50dffbf77180 Merge tag 'for-v6.9-rc' of git://git.kernel.o.. > git tree: upstream > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10ba57bb180000 #syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 50dffbf77180 --- l/net/bluetooth/hci_request.c +++ y/net/bluetooth/hci_request.c @@ -181,7 +181,6 @@ int __hci_req_sync(struct hci_dev *hdev, break; } - kfree_skb(hdev->req_skb); hdev->req_skb = NULL; hdev->req_status = hdev->req_result = 0; --