Hi Gustavo,
Have you checked my patch fixing this issue, I sent it of Friday,
attaching it here just in case.
Best regards
Andrei Emeltchenko
On Fri, Sep 28, 2012 at 09:23:23AM +0800, Fengguang Wu wrote:
> Hi Andrei,
>
> FYI, there are new smatch warnings show up in
>
> tree: git://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth-next.git master
> head: 29d8a5909bba10accb82eb805c884a2943d7710f
> commit: 8e2a0d92c56ec6955526a8b60838c9b00f70540d [222/247] Bluetooth: AMP: Use HCI cmd to Read AMP Info
>
> net/bluetooth/a2mp.c:61 a2mp_send() Error invalid range 4096 to -1
> + net/bluetooth/a2mp.c:205 a2mp_getinfo_req() error: we previously assumed 'hdev' could be null (see line 195)
>
> vim +205 net/bluetooth/a2mp.c
>
> 47f2d97d (Andrei Emeltchenko 2012-05-29 189) if (le16_to_cpu(hdr->len) < sizeof(*req))
> 47f2d97d (Andrei Emeltchenko 2012-05-29 190) return -EINVAL;
> 47f2d97d (Andrei Emeltchenko 2012-05-29 191)
> 47f2d97d (Andrei Emeltchenko 2012-05-29 192) BT_DBG("id %d", req->id);
> 47f2d97d (Andrei Emeltchenko 2012-05-29 193)
> 47f2d97d (Andrei Emeltchenko 2012-05-29 194) hdev = hci_dev_get(req->id);
> 8e2a0d92 (Andrei Emeltchenko 2012-09-27 @195) if (!hdev) {
> 8e2a0d92 (Andrei Emeltchenko 2012-09-27 196) struct a2mp_info_rsp rsp;
> 8e2a0d92 (Andrei Emeltchenko 2012-09-27 197)
> 8e2a0d92 (Andrei Emeltchenko 2012-09-27 198) rsp.id = req->id;
> 8e2a0d92 (Andrei Emeltchenko 2012-09-27 199) rsp.status = A2MP_STATUS_INVALID_CTRL_ID;
> 8e2a0d92 (Andrei Emeltchenko 2012-09-27 200)
> 8e2a0d92 (Andrei Emeltchenko 2012-09-27 201) a2mp_send(mgr, A2MP_GETINFO_RSP, hdr->ident, sizeof(rsp),
> 8e2a0d92 (Andrei Emeltchenko 2012-09-27 202) &rsp);
> 47f2d97d (Andrei Emeltchenko 2012-05-29 203) }
> 47f2d97d (Andrei Emeltchenko 2012-05-29 204)
> 8e2a0d92 (Andrei Emeltchenko 2012-09-27 @205) if (hdev->dev_type != HCI_BREDR) {
> 8e2a0d92 (Andrei Emeltchenko 2012-09-27 206) mgr->state = READ_LOC_AMP_INFO;
> 8e2a0d92 (Andrei Emeltchenko 2012-09-27 207) hci_send_cmd(hdev, HCI_OP_READ_LOCAL_AMP_INFO, 0, NULL);
> 8e2a0d92 (Andrei Emeltchenko 2012-09-27 208) }
> 47f2d97d (Andrei Emeltchenko 2012-05-29 209)
> 8e2a0d92 (Andrei Emeltchenko 2012-09-27 210) hci_dev_put(hdev);
> 47f2d97d (Andrei Emeltchenko 2012-05-29 211)
> 47f2d97d (Andrei Emeltchenko 2012-05-29 212) skb_pull(skb, sizeof(*req));
> 47f2d97d (Andrei Emeltchenko 2012-05-29 213) return 0;
>
> ---
> 0-DAY kernel build testing backend Open Source Technology Centre
> Fengguang Wu, Yuanhan Liu Intel Corporation
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>From 69ad5c2634b4207317d8ce49f765d748ca27c487 Mon Sep 17 00:00:00 2001
From: Andrei Emeltchenko <andrei.emeltchenko@xxxxxxxxx>
Date: Fri, 28 Sep 2012 14:03:35 +0300
Subject: [RESEND PATCH] Bluetooth: A2MP: Fix potential NULL dereference
Return INVALID_CTRL_ID for unknown AMP controller and for BR/EDR
controller and fixes dereference possible NULL pointer. Issue reported
by Fengguang Wu <fengguang.wu@xxxxxxxxx>.
Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@xxxxxxxxx>
---
net/bluetooth/a2mp.c | 14 ++++++++------
1 file changed, 8 insertions(+), 6 deletions(-)
diff --git a/net/bluetooth/a2mp.c b/net/bluetooth/a2mp.c
index 42788cd..d4946b5 100644
--- a/net/bluetooth/a2mp.c
+++ b/net/bluetooth/a2mp.c
@@ -278,7 +278,7 @@ static int a2mp_getinfo_req(struct amp_mgr *mgr, struct sk_buff *skb,
BT_DBG("id %d", req->id);
hdev = hci_dev_get(req->id);
- if (!hdev) {
+ if (!hdev || hdev->dev_type != HCI_AMP) {
struct a2mp_info_rsp rsp;
rsp.id = req->id;
@@ -286,14 +286,16 @@ static int a2mp_getinfo_req(struct amp_mgr *mgr, struct sk_buff *skb,
a2mp_send(mgr, A2MP_GETINFO_RSP, hdr->ident, sizeof(rsp),
&rsp);
- }
- if (hdev->dev_type != HCI_BREDR) {
- mgr->state = READ_LOC_AMP_INFO;
- hci_send_cmd(hdev, HCI_OP_READ_LOCAL_AMP_INFO, 0, NULL);
+ goto done;
}
- hci_dev_put(hdev);
+ mgr->state = READ_LOC_AMP_INFO;
+ hci_send_cmd(hdev, HCI_OP_READ_LOCAL_AMP_INFO, 0, NULL);
+
+done:
+ if (hdev)
+ hci_dev_put(hdev);
skb_pull(skb, sizeof(*req));
return 0;
--
1.7.9.5
