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Bluetooth: qca: fix NVM configuration parsing

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commit a112d3c72a upstream.

The NVM configuration files used by WCN3988 and WCN3990/1/8 have two
sets of configuration tags that are enclosed by a type-length header of
type four which the current parser fails to account for.

Instead the driver happily parses random data as if it were valid tags,
something which can lead to the configuration data being corrupted if it
ever encounters the words 0x0011 or 0x001b.

As is clear from commit b63882549b ("Bluetooth: btqca: Fix the NVM
baudrate tag offcet for wcn3991") the intention has always been to
process the configuration data also for WCN3991 and WCN3998 which
encodes the baud rate at a different offset.

Fix the parser so that it can handle the WCN3xxx configuration files,
which has an enclosing type-length header of type four and two sets of
TLV tags enclosed by a type-length header of type two and three,
respectively.

Note that only the first set, which contains the tags the driver is
currently looking for, will be parsed for now.

With the parser fixed, the software in-band sleep bit will now be set
for WCN3991 and WCN3998 (as it is for later controllers) and the default
baud rate 3200000 may be updated by the driver also for WCN3xxx
controllers.

Notably the deep-sleep feature bit is already set by default in all
configuration files in linux-firmware.

Fixes: 4219d46868 ("Bluetooth: btqca: Add wcn3990 firmware download support.")
Cc: stable@vger.kernel.org	# 4.19
Cc: Matthias Kaehlcke <mka@chromium.org>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2024-04-30 19:07:40 +02:00 committed by Greg Kroah-Hartman
parent 427281f949
commit c3a38d10b9
1 changed files with 22 additions and 2 deletions
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24
drivers/bluetooth/btqca.c
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@ -281,6 +281,7 @@ static int qca_tlv_check_data(struct hci_dev *hdev,
struct tlv_type_patch *tlv_patch;
struct tlv_type_nvm *tlv_nvm;
uint8_t nvm_baud_rate = config->user_baud_rate;
u8 type;
config->dnld_mode = QCA_SKIP_EVT_NONE;
config->dnld_type = QCA_SKIP_EVT_NONE;
@ -346,11 +347,30 @@ static int qca_tlv_check_data(struct hci_dev *hdev,
tlv = (struct tlv_type_hdr *)fw_data;
type_len = le32_to_cpu(tlv->type_len);
length = (type_len >> 8) & 0x00ffffff;
length = type_len >> 8;
type = type_len & 0xff;
BT_DBG("TLV Type\t\t : 0x%x", type_len & 0x000000ff);
/* Some NVM files have more than one set of tags, only parse
* the first set when it has type 2 for now. When there is
* more than one set there is an enclosing header of type 4.
*/
if (type == 4) {
if (fw_size < 2 * sizeof(struct tlv_type_hdr))
return -EINVAL;
tlv++;
type_len = le32_to_cpu(tlv->type_len);
length = type_len >> 8;
type = type_len & 0xff;
}
BT_DBG("TLV Type\t\t : 0x%x", type);
BT_DBG("Length\t\t : %d bytes", length);
if (type != 2)
break;
if (fw_size < length + (tlv->data - fw_data))
return -EINVAL;