From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 1CEF625393E; Tue, 25 Aug 2026 13:50:48 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787665849; cv=none; b=hrVqdwUN/zYd5u5C4SpANNulbycOOJ43dKoGhQK63ac4sJOCfVU8I2zCuAEMGRT3jyPwCmkFL8cNUbxFgUjzAPanQQYXANAB9TCS+CJFeGBs/cx7ioz1lIep8KmeqTCr3Rh+6K6df8YY/qsxfBl3v89eB/XAGUh0ecrVxT7dWCA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787665849; c=relaxed/simple; bh=G2svGJm7XOIQAGG31LdtGakf2tXtzjYxJ0kRPjhD1IA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=edODpSAEBnnCLrIaG5vHJwhpf4grySf1JM7SeLltes2+BNHLLjKJEDeyIDSzuAkWaFqPoflSIYsxnFcTkaXt1e9WpWnSJq12AtxJNCNUwpONmWl83GQq35Hw2gZOHdsudaWRuzCYmM+G4cLkA85EndSuq+c7vrzeZbfG1gop6I0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=xTPQy6td; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="xTPQy6td" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 746E51F000E9; Tue, 25 Aug 2026 13:50:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1787665848; bh=OzVyqpWYaVZADlMYtE8D5U+OjtSNeWFfwA9OvR0Xsqo=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=xTPQy6tdPNXtdOMD9GQNRpyBmr4dkCa3MLX7hQ1usTbkrCqGOmLJesHy89h1RWGYa gfnuqdNA1BYf25310quRwptTGjustvbRTCnJXPRtSzqcXR/SWELVnx8y67Xcd1RaLI bWUdBGe3jfeJqHIZYet3oKhPniTxIUdjihmQVZG8= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Chengfeng Ye , Luiz Augusto von Dentz Subject: [PATCH 6.6 86/87] Bluetooth: hci_event: fix LE list UAF on reset Date: Tue, 25 Aug 2026 15:26:49 +0200 Message-ID: <20260825132545.144131218@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260825132541.813800447@linuxfoundation.org> References: <20260825132541.813800447@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Chengfeng Ye commit 33af47e847fe4a28b109673affb5874015d54f5a upstream. hci_cc_reset() clears the LE accept and resolving lists without taking hdev->lock. Other command-complete handlers serialize updates to these lists with that lock, and the debugfs readers hold it while walking them. This permits the reset completion and a debugfs read to interleave as follows: hci_rx_work debugfs reader ----------- -------------- lock hdev->lock fetch current entry list_del(entry) kfree(entry) read entry fields The reader then dereferences a freed list entry and may follow its stale next pointer. KASAN reported: BUG: KASAN: slab-use-after-free in white_list_show+0x15f/0x180 Read of size 1 at addr ffff8881015dab16 by task poc/95 Call Trace: white_list_show+0x15f/0x180 seq_read_iter+0x3ff/0x1190 seq_read+0x267/0x3d0 vfs_read+0x177/0xa20 ksys_read+0xf7/0x1c0 Allocated by task 91: hci_bdaddr_list_add+0x1a6/0x3a0 hci_cc_le_add_to_accept_list+0xab/0x140 hci_cmd_complete_evt+0x26c/0x9a0 hci_event_packet+0x454/0xb20 hci_rx_work+0x293/0x730 Freed by task 90: kfree+0x131/0x3c0 hci_bdaddr_list_clear+0xd8/0x160 hci_cc_reset+0x28a/0x370 hci_cmd_complete_evt+0x26c/0x9a0 hci_event_packet+0x454/0xb20 hci_rx_work+0x293/0x730 Take hdev->lock around both list clears. This matches the existing mutation and traversal locking convention. Fixes: a4d5504d5c39 ("Bluetooth: Clear LE white list when resetting controller") Fixes: cfdb0c2d095a ("Bluetooth: Store Resolv list size") Cc: stable@vger.kernel.org Signed-off-by: Chengfeng Ye Signed-off-by: Luiz Augusto von Dentz Signed-off-by: Greg Kroah-Hartman --- net/bluetooth/hci_event.c | 2 ++ 1 file changed, 2 insertions(+) --- a/net/bluetooth/hci_event.c +++ b/net/bluetooth/hci_event.c @@ -294,8 +294,10 @@ static u8 hci_cc_reset(struct hci_dev *h hdev->ssp_debug_mode = 0; + hci_dev_lock(hdev); hci_bdaddr_list_clear(&hdev->le_accept_list); hci_bdaddr_list_clear(&hdev->le_resolv_list); + hci_dev_unlock(hdev); return rp->status; }