From patchwork Thu Dec 13 13:57:26 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [081/241] Bluetooth: Fix having bogus entries in mgmt_read_index_list reply Date: Thu, 13 Dec 2012 03:57:26 -0000 From: Herton Ronaldo Krzesinski X-Patchwork-Id: 205930 Message-Id: <1355407206-17100-82-git-send-email-herton.krzesinski@canonical.com> To: linux-kernel@vger.kernel.org, stable@vger.kernel.org, kernel-team@lists.ubuntu.com Cc: Johan Hedberg , Gustavo Padovan 3.5.7.2 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Johan Hedberg commit 476e44cb19f1fbf2d5883dddcc0ce31b33b45915 upstream. The mgmt_read_index_list uses one loop to calculate the max needed size of its response with the help of an upper-bound of the controller count. The second loop is more strict as it checks for HCI_SETUP (which might have gotten set after the first loop) and could result in some indexes being skipped. Because of this the function needs to readjust the event length and index count after filling in the response array. Signed-off-by: Johan Hedberg Acked-by: Marcel Holtmann Signed-off-by: Gustavo Padovan [ herton: unfuzz patch ] Signed-off-by: Herton Ronaldo Krzesinski --- net/bluetooth/mgmt.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c index 3571450..ec098bd 100644 --- a/net/bluetooth/mgmt.c +++ b/net/bluetooth/mgmt.c @@ -323,7 +323,7 @@ static int read_index_list(struct sock *sk, struct hci_dev *hdev, void *data, struct hci_dev *d; size_t rp_len; u16 count; - int i, err; + int err; BT_DBG("sock %p", sk); @@ -341,17 +341,18 @@ static int read_index_list(struct sock *sk, struct hci_dev *hdev, void *data, return -ENOMEM; } - rp->num_controllers = cpu_to_le16(count); - - i = 0; + count = 0; list_for_each_entry(d, &hci_dev_list, list) { if (test_bit(HCI_SETUP, &d->dev_flags)) continue; - rp->index[i++] = cpu_to_le16(d->id); + rp->index[count++] = cpu_to_le16(d->id); BT_DBG("Added hci%u", d->id); } + rp->num_controllers = cpu_to_le16(count); + rp_len = sizeof(*rp) + (2 * count); + read_unlock(&hci_dev_list_lock); err = cmd_complete(sk, MGMT_INDEX_NONE, MGMT_OP_READ_INDEX_LIST, 0, rp,