CVE-2024-36016

In the Linux kernel, the following vulnerability has been resolved: tty:
n_gsm: fix possible out-of-bounds in gsm0_receive() Assuming the following:

• side A configures the n_gsm in basic option mode - side B sends the
  header of a basic option mode frame with data length 1 - side A switches to
  advanced option mode - side B sends 2 data bytes which exceeds gsm->len
  Reason: gsm->len is not used in advanced option mode. - side A switches to
  basic option mode - side B keeps sending until gsm0_receive() writes past
  gsm->buf Reason: Neither gsm->state nor gsm->len have been reset after
  reconfiguration. Fix this by changing gsm->count to gsm->len comparison
  from equal to less than. Also add upper limit checks against the constant
  MAX_MRU in gsm0_receive() and gsm1_receive() to harden against memory
  corruption of gsm->len and gsm->mru. All other checks remain as we still
  need to limit the data according to the user configuration and actual
  payload size.

Notes