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Bluetooth: Fix eir name length

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[ Upstream commit 2ab3e8d67f ]

According to Section 1.2 of Core Specification Supplement Part A the
complete or short name strings are defined as utf8s, which should not
include the trailing NULL for variable length array as defined in Core
Specification Vol1 Part E Section 2.9.3.

Removing the trailing NULL allows PTS to retrieve the random address based
on device name, e.g. for SM/PER/KDU/BV-02-C, SM/PER/KDU/BV-08-C or
GAP/BROB/BCST/BV-03-C.

Fixes: f61851f64b ("Bluetooth: Fix append max 11 bytes of name to scan rsp data")
Signed-off-by: Frédéric Danis <frederic.danis@collabora.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Frédéric Danis 2024-03-07 17:42:05 +01:00 committed by Sasha Levin
parent 6fef878366
commit 8cba276790
2 changed files with 8 additions and 23 deletions
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29
net/bluetooth/eir.c
View File

@ -13,48 +13,33 @@
#define PNP_INFO_SVCLASS_ID 0x1200
static u8 eir_append_name(u8 *eir, u16 eir_len, u8 type, u8 *data, u8 data_len)
{
u8 name[HCI_MAX_SHORT_NAME_LENGTH + 1];
/* If data is already NULL terminated just pass it directly */
if (data[data_len - 1] == '\0')
return eir_append_data(eir, eir_len, type, data, data_len);
memcpy(name, data, HCI_MAX_SHORT_NAME_LENGTH);
name[HCI_MAX_SHORT_NAME_LENGTH] = '\0';
return eir_append_data(eir, eir_len, type, name, sizeof(name));
}
u8 eir_append_local_name(struct hci_dev *hdev, u8 *ptr, u8 ad_len)
{
size_t short_len;
size_t complete_len;
/* no space left for name (+ NULL + type + len) */
if ((max_adv_len(hdev) - ad_len) < HCI_MAX_SHORT_NAME_LENGTH + 3)
/* no space left for name (+ type + len) */
if ((max_adv_len(hdev) - ad_len) < HCI_MAX_SHORT_NAME_LENGTH + 2)
return ad_len;
/* use complete name if present and fits */
complete_len = strnlen(hdev->dev_name, sizeof(hdev->dev_name));
if (complete_len && complete_len <= HCI_MAX_SHORT_NAME_LENGTH)
return eir_append_name(ptr, ad_len, EIR_NAME_COMPLETE,
hdev->dev_name, complete_len + 1);
return eir_append_data(ptr, ad_len, EIR_NAME_COMPLETE,
hdev->dev_name, complete_len);
/* use short name if present */
short_len = strnlen(hdev->short_name, sizeof(hdev->short_name));
if (short_len)
return eir_append_name(ptr, ad_len, EIR_NAME_SHORT,
return eir_append_data(ptr, ad_len, EIR_NAME_SHORT,
hdev->short_name,
short_len == HCI_MAX_SHORT_NAME_LENGTH ?
short_len : short_len + 1);
short_len);
/* use shortened full name if present, we already know that name
* is longer then HCI_MAX_SHORT_NAME_LENGTH
*/
if (complete_len)
return eir_append_name(ptr, ad_len, EIR_NAME_SHORT,
return eir_append_data(ptr, ad_len, EIR_NAME_SHORT,
hdev->dev_name,
HCI_MAX_SHORT_NAME_LENGTH);

2
net/bluetooth/mgmt.c
View File

@ -8400,7 +8400,7 @@ static int read_adv_features(struct sock *sk, struct hci_dev *hdev,
static u8 calculate_name_len(struct hci_dev *hdev)
{
u8 buf[HCI_MAX_SHORT_NAME_LENGTH + 3];
u8 buf[HCI_MAX_SHORT_NAME_LENGTH + 2]; /* len + type + name */
return eir_append_local_name(hdev, buf, 0);
}