Wind River Support Network

Description

In the Linux kernel, the following vulnerability has been resolved:[EOL][EOL]tty: n_gsm: Don't block input queue by waiting MSC[EOL][EOL]Currently gsm_queue() processes incoming frames and when opening[EOL]a DLC channel it calls gsm_dlci_open() which calls gsm_modem_update().[EOL]If basic mode is used it calls gsm_modem_upd_via_msc() and it[EOL]cannot block the input queue by waiting the response to come[EOL]into the same input queue.[EOL][EOL]Instead allow sending Modem Status Command without waiting for remote[EOL]end to respond. Define a new function gsm_modem_send_initial_msc()[EOL]for this purpose. As MSC is only valid for basic encoding, it does[EOL]not do anything for advanced or when convergence layer type 2 is used.