Bluetooth: Fix debugfs NULL pointer dereference
Fix crash caused by NULL pointer dereference when debugfs functions le_max_key_read, le_max_key_size_write, le_min_key_size_read or le_min_key_size_write and Bluetooth adapter was powered off. Fix is to move max_key_size and min_key_size from smp_dev to hci_dev. At the same time they were renamed to le_max_key_size and le_min_key_size. BUG: unable to handle kernel NULL pointer dereference at 00000000000002e8 PGD 0 P4D 0 Oops: 0000 [#24] SMP PTI CPU: 2 PID: 6255 Comm: cat Tainted: G D OE 4.18.9-200.fc28.x86_64 #1 Hardware name: LENOVO 4286CTO/4286CTO, BIOS 8DET76WW (1.46 ) 06/21/2018 RIP: 0010:le_max_key_size_read+0x45/0xb0 [bluetooth] Code: 00 00 00 48 83 ec 10 65 48 8b 04 25 28 00 00 00 48 89 44 24 08 31 c0 48 8b 87 c8 00 00 00 48 8d 7c 24 04 48 8b 80 48 0a 00 00 <48> 8b 80 e8 02 00 00 0f b6 48 52 e8 fb b6 b3 ed be 04 00 00 00 48 RSP: 0018:ffffab23c3ff3df0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 00007f0b4ca2e000 RCX: ffffab23c3ff3f08 RDX: ffffffffc0ddb033 RSI: 0000000000000004 RDI: ffffab23c3ff3df4 RBP: 0000000000020000 R08: 0000000000000000 R09: 0000000000000000 R10: ffffab23c3ff3ed8 R11: 0000000000000000 R12: ffffab23c3ff3f08 R13: 00007f0b4ca2e000 R14: 0000000000020000 R15: ffffab23c3ff3f08 FS: 00007f0b4ca0f540(0000) GS:ffff91bd5e280000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000000002e8 CR3: 00000000629fa006 CR4: 00000000000606e0 Call Trace: full_proxy_read+0x53/0x80 __vfs_read+0x36/0x180 vfs_read+0x8a/0x140 ksys_read+0x4f/0xb0 do_syscall_64+0x5b/0x160 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Signed-off-by: Matias Karhumaa <matias.karhumaa@gmail.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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@ -267,6 +267,8 @@ struct hci_dev {
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__u16 le_max_tx_time;
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__u16 le_max_rx_len;
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__u16 le_max_rx_time;
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__u8 le_max_key_size;
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__u8 le_min_key_size;
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__u16 discov_interleaved_timeout;
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__u16 conn_info_min_age;
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__u16 conn_info_max_age;
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@ -3147,6 +3147,8 @@ struct hci_dev *hci_alloc_dev(void)
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hdev->le_max_tx_time = 0x0148;
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hdev->le_max_rx_len = 0x001b;
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hdev->le_max_rx_time = 0x0148;
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hdev->le_max_key_size = SMP_MAX_ENC_KEY_SIZE;
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hdev->le_min_key_size = SMP_MIN_ENC_KEY_SIZE;
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hdev->le_tx_def_phys = HCI_LE_SET_PHY_1M;
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hdev->le_rx_def_phys = HCI_LE_SET_PHY_1M;
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@ -88,9 +88,6 @@ struct smp_dev {
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u8 local_rand[16];
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bool debug_key;
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u8 min_key_size;
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u8 max_key_size;
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struct crypto_cipher *tfm_aes;
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struct crypto_shash *tfm_cmac;
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struct crypto_kpp *tfm_ecdh;
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@ -720,7 +717,7 @@ static void build_pairing_cmd(struct l2cap_conn *conn,
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if (rsp == NULL) {
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req->io_capability = conn->hcon->io_capability;
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req->oob_flag = oob_flag;
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req->max_key_size = SMP_DEV(hdev)->max_key_size;
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req->max_key_size = hdev->le_max_key_size;
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req->init_key_dist = local_dist;
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req->resp_key_dist = remote_dist;
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req->auth_req = (authreq & AUTH_REQ_MASK(hdev));
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@ -731,7 +728,7 @@ static void build_pairing_cmd(struct l2cap_conn *conn,
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rsp->io_capability = conn->hcon->io_capability;
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rsp->oob_flag = oob_flag;
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rsp->max_key_size = SMP_DEV(hdev)->max_key_size;
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rsp->max_key_size = hdev->le_max_key_size;
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rsp->init_key_dist = req->init_key_dist & remote_dist;
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rsp->resp_key_dist = req->resp_key_dist & local_dist;
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rsp->auth_req = (authreq & AUTH_REQ_MASK(hdev));
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@ -745,7 +742,7 @@ static u8 check_enc_key_size(struct l2cap_conn *conn, __u8 max_key_size)
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struct hci_dev *hdev = conn->hcon->hdev;
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struct smp_chan *smp = chan->data;
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if (max_key_size > SMP_DEV(hdev)->max_key_size ||
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if (max_key_size > hdev->le_max_key_size ||
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max_key_size < SMP_MIN_ENC_KEY_SIZE)
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return SMP_ENC_KEY_SIZE;
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@ -3243,8 +3240,6 @@ static struct l2cap_chan *smp_add_cid(struct hci_dev *hdev, u16 cid)
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smp->tfm_aes = tfm_aes;
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smp->tfm_cmac = tfm_cmac;
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smp->tfm_ecdh = tfm_ecdh;
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smp->min_key_size = SMP_MIN_ENC_KEY_SIZE;
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smp->max_key_size = SMP_MAX_ENC_KEY_SIZE;
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create_chan:
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chan = l2cap_chan_create();
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@ -3370,7 +3365,7 @@ static ssize_t le_min_key_size_read(struct file *file,
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struct hci_dev *hdev = file->private_data;
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char buf[4];
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snprintf(buf, sizeof(buf), "%2u\n", SMP_DEV(hdev)->min_key_size);
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snprintf(buf, sizeof(buf), "%2u\n", hdev->le_min_key_size);
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return simple_read_from_buffer(user_buf, count, ppos, buf, strlen(buf));
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}
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@ -3391,11 +3386,11 @@ static ssize_t le_min_key_size_write(struct file *file,
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sscanf(buf, "%hhu", &key_size);
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if (key_size > SMP_DEV(hdev)->max_key_size ||
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if (key_size > hdev->le_max_key_size ||
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key_size < SMP_MIN_ENC_KEY_SIZE)
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return -EINVAL;
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SMP_DEV(hdev)->min_key_size = key_size;
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hdev->le_min_key_size = key_size;
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return count;
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}
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@ -3414,7 +3409,7 @@ static ssize_t le_max_key_size_read(struct file *file,
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struct hci_dev *hdev = file->private_data;
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char buf[4];
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snprintf(buf, sizeof(buf), "%2u\n", SMP_DEV(hdev)->max_key_size);
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snprintf(buf, sizeof(buf), "%2u\n", hdev->le_max_key_size);
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return simple_read_from_buffer(user_buf, count, ppos, buf, strlen(buf));
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}
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@ -3436,10 +3431,10 @@ static ssize_t le_max_key_size_write(struct file *file,
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sscanf(buf, "%hhu", &key_size);
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if (key_size > SMP_MAX_ENC_KEY_SIZE ||
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key_size < SMP_DEV(hdev)->min_key_size)
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key_size < hdev->le_min_key_size)
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return -EINVAL;
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SMP_DEV(hdev)->max_key_size = key_size;
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hdev->le_max_key_size = key_size;
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return count;
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}
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