From: Johan Hedberg Date: Fri, 11 Mar 2016 07:56:33 +0000 (+0200) Subject: Bluetooth: Fix potential buffer overflow with Add Advertising X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=6a0e78072c2ae7b20b14e0249d8108441ea928d2;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git Bluetooth: Fix potential buffer overflow with Add Advertising The Add Advertising command handler does the appropriate checks for the AD and Scan Response data, however fails to take into account the general length of the mgmt command itself, which could lead to potential buffer overflows. This patch adds the necessary check that the mgmt command length is consistent with the given ad and scan_rsp lengths. Signed-off-by: Johan Hedberg Signed-off-by: Marcel Holtmann Cc: stable@vger.kernel.org --- diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c index c856fb65812c..9e4b931588cf 100644 --- a/net/bluetooth/mgmt.c +++ b/net/bluetooth/mgmt.c @@ -5995,6 +5995,10 @@ static int add_advertising(struct sock *sk, struct hci_dev *hdev, return mgmt_cmd_status(sk, hdev->id, MGMT_OP_ADD_ADVERTISING, MGMT_STATUS_INVALID_PARAMS); + if (data_len != sizeof(*cp) + cp->adv_data_len + cp->scan_rsp_len) + return mgmt_cmd_status(sk, hdev->id, MGMT_OP_ADD_ADVERTISING, + MGMT_STATUS_INVALID_PARAMS); + flags = __le32_to_cpu(cp->flags); timeout = __le16_to_cpu(cp->timeout); duration = __le16_to_cpu(cp->duration);