[bluez/bluez] 6b9dff: shared/vcp: use iov_pull in input parsing

[Luiz Augusto von Dentz <noreply@github.com>]

  Branch: refs/heads/master
  Home:   https://github.com/bluez/bluez
  Commit: 6b9dff8fe39671037cafcc8b7f76ee3383355115
      https://github.com/bluez/bluez/commit/6b9dff8fe39671037cafcc8b7f76ee3383355115
  Author: Pauli Virtanen <pav@iki.fi>
  Date:   2025-05-05 (Mon, 05 May 2025)

  Changed paths:
    M src/shared/vcp.c

  Log Message:
  -----------
  shared/vcp: use iov_pull in input parsing

Check input is right size by using iov_pull* when parsing.

Also replace custom iov_pull_mem by equivalent util_iov_pull_mem, and
add iov_pull_string.

Fixes handling of zero-length string-valued descriptors, !value is not
error.

Fixes crashes like:

ERROR: AddressSanitizer: stack-buffer-overflow
WRITE of size 3 at 0x7b878bb77161 thread T0
    #0 0x7f878eee4821 in memcpy
    #1 0x0000009544d4 in read_aics_aud_ip_type src/shared/vcp.c:2713
    #2 0x000000950cec in vcp_pending_complete src/shared/vcp.c:2394
    #3 0x00000088b2ce in read_cb src/shared/gatt-client.c:2717


  Commit: 4bbfd9712857d4983593df23b82eb599907e6a69
      https://github.com/bluez/bluez/commit/4bbfd9712857d4983593df23b82eb599907e6a69
  Author: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
  Date:   2025-05-05 (Mon, 05 May 2025)

  Changed paths:
    M src/shared/bap.c

  Log Message:
  -----------
  shared/bap: Fix handling of ASCS_Codec_Config

The codec under bt_ascs_config is in little endian which may differ
from the native endianness when it comes to vendor specific field that
are multibyte causing the following error:

BAP/USR/SCC/BV-033-C [USR SNK Config Codec, VS] - setup complete
BAP/USR/SCC/BV-033-C [USR SNK Config Codec, VS] - run
...
 bt_gatt_server:src/shared/gatt-server.c:write_cb() Write Cmd - handle: 0x0022
 bt_bap:src/shared/bap.c:ascs_ase_cp_write() Codec Config
 bt_bap:src/shared/bap.c:ascs_config() codec 0xff phy 0x02 latency 2
 bt_bap:src/shared/bap.c:ep_config() ep 0x21d6600 id 0x01 dir 0x01
 handle 0x0022 len 5
 test-bap: > 1b 22 00 01 01 01 09 01             ."......
 test-bap: ! 1b 22 00 01 01 01 00 00             ."......


Compare: https://github.com/bluez/bluez/compare/0831bd39a0bd...4bbfd9712857

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