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| author | Douglas Anderson <dianders@chromium.org> | 2016-02-19 14:25:21 -0800 |
|---|---|---|
| committer | Marcel Holtmann <marcel@holtmann.org> | 2016-02-20 08:52:28 +0100 |
| commit | 3bd7594e69bd97c962faa6a5ae15dd8c6c082636 (patch) | |
| tree | 13d778f68c03381a1a54bdc31fb454adbff66c0d /net/bluetooth | |
| parent | d07c0278da1f4cfc91c3d46d0d07a0d13a949892 (diff) | |
| download | linux-0-day-3bd7594e69bd97c962faa6a5ae15dd8c6c082636.tar.gz linux-0-day-3bd7594e69bd97c962faa6a5ae15dd8c6c082636.tar.xz | |
Bluetooth: hci_core: Avoid mixing up req_complete and req_complete_skb
In commit 44d271377479 ("Bluetooth: Compress the size of struct
hci_ctrl") we squashed down the size of the structure by using a union
with the assumption that all users would use the flag to determine
whether we had a req_complete or a req_complete_skb.
Unfortunately we had a case in hci_req_cmd_complete() where we weren't
looking at the flag. This can result in a situation where we might be
storing a hci_req_complete_skb_t in a hci_req_complete_t variable, or
vice versa.
During some testing I found at least one case where the function
hci_req_sync_complete() was called improperly because the kernel thought
that it didn't require an SKB. Looking through the stack in kgdb I
found that it was called by hci_event_packet() and that
hci_event_packet() had both of its locals "req_complete" and
"req_complete_skb" pointing to the same place: both to
hci_req_sync_complete().
Let's make sure we always check the flag.
For more details on debugging done, see <http://crbug.com/588288>.
Fixes: 44d271377479 ("Bluetooth: Compress the size of struct hci_ctrl")
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Acked-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Diffstat (limited to 'net/bluetooth')
| -rw-r--r-- | net/bluetooth/hci_core.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c index 47bcef7547967..883c821a9e784 100644 --- a/net/bluetooth/hci_core.c +++ b/net/bluetooth/hci_core.c @@ -4112,8 +4112,10 @@ void hci_req_cmd_complete(struct hci_dev *hdev, u16 opcode, u8 status, break; } - *req_complete = bt_cb(skb)->hci.req_complete; - *req_complete_skb = bt_cb(skb)->hci.req_complete_skb; + if (bt_cb(skb)->hci.req_flags & HCI_REQ_SKB) + *req_complete_skb = bt_cb(skb)->hci.req_complete_skb; + else + *req_complete = bt_cb(skb)->hci.req_complete; kfree_skb(skb); } spin_unlock_irqrestore(&hdev->cmd_q.lock, flags); |