In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: MGMT: validate advertising TLV before type checks

tlv_data_is_valid() reads each advertising data field length from
data[i], then inspects data[i + 1] for managed EIR types before
checking that the current field still fits inside the supplied buffer.

A malformed field whose length byte is the last byte of the buffer can
therefore make the parser read one byte past the advertising data.

KASAN reported the following when a malformed MGMT_OP_ADD_ADVERTISING
request reached that path:

  BUG: KASAN: vmalloc-out-of-bounds in tlv_data_is_valid()
  Read of size 1
  Call trace:
    tlv_data_is_valid()
    add_advertising()
    hci_mgmt_cmd()
    hci_sock_sendmsg()

Move the existing element-length check before any type-octet inspection
so each non-empty element is proven to contain its type byte before the
parser looks at data[i + 1].

https://git.kernel.org/stable/c/06fcbd79c3c360a50f9be9d370769bbd738d0976

https://git.kernel.org/stable/c/13ad995071a06570668dd8daab3616c247c72080

https://git.kernel.org/stable/c/18fea1cb0c2599752e908c8217490f73ddd33e00

https://git.kernel.org/stable/c/1a3c8ffbb469859b076445af44bdfa6a711d483e

https://git.kernel.org/stable/c/2a3f3ed9e198ae23c15859ace2f9ca6cfdc35b57

https://git.kernel.org/stable/c/74c08e4db35a476c3462aeb65846f955be732626

https://git.kernel.org/stable/c/de23fb62259aa01d294f77238ae3b835eb674413

https://git.kernel.org/stable/c/f7093ac233c1e7f51d125534f46067772a113175

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