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 1679D47143A; Tue, 25 Aug 2026 13:42:18 +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=1787665339; cv=none; b=UCv8Ykbl4bddgeovl4Cx6WxXq6ygxBRP2yvJPS/YqXXFn3lNmBoC7T4lF2Ugs5GmqdYU7lKqG78w52mGpx0OKCb4Lo3Qw3xjvJd0QCbUb3GT97wq+ukCucdCZUm8CHsnLO72yp5pC+Rqk33k5IXHCjZRIx3jqqighWzRebtgGTM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787665339; c=relaxed/simple; bh=+ypRHVt8PYdWC8bdiDZWT7YiCN3vxq5uP+Lg/uXg7OU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=nDHjXgVXTLlzfLJTocCEUxvk1aN4WLerO+IytVXWNyBdjA1celSVx7eV+b8Qt1KuzQW8wYVrNEBRZL8F+qUxMbLq1J49TbY4Ozj3fHe05ePTNkqCsc7so4T2Xof0R0oWIkupRDcGIDOyRLxmzAwYvZzooaEO/fr9zwWIXV38xQk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=y5X/mUhW; 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="y5X/mUhW" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 684BA1F000E9; Tue, 25 Aug 2026 13:42:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1787665338; bh=AjHnPfVLOlkHdVhFlAhrnPNd29uNG00CyTVZSDN17Mc=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=y5X/mUhW9GbIjItmnSADiLJz0H17Sbc7/Ue+seFw6wn0G6IuHqQrT82Yy6zOD86mp ZI6mp/MrgQtDav/j3hcVYDHr2XJLOonojQ2g3p+1Zn2RsmEPeSAsjNBDBopeTWLSNN kROgJOqchODTZXWDr0uxBzoF9t7FOCUjbXOhdYI0= 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 6.18 88/94] Bluetooth: hci_event: fix LE list UAF on reset Date: Tue, 25 Aug 2026 15:26:24 +0200 Message-ID: <20260825132545.226069029@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260825132541.887883084@linuxfoundation.org> References: <20260825132541.887883084@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 6.18-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 @@ -293,8 +293,10 @@ 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; }