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tty: n_gsm: fix wrong modem processing in convergence layer type 2

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The function gsm_process_modem() exists to handle modem status bits of
incoming frames. This includes incoming MSC (modem status command) frames
and convergence layer type 2 data frames. The function, however, was only
designed to handle MSC frames as it expects the command length. Within
gsm_dlci_data() it is wrongly assumed that this is the same as the data
frame length. This is only true if the data frame contains only 1 byte of
payload.

This patch names the length parameter of gsm_process_modem() in a generic
manner to reflect its association. It also corrects all calls to the
function to handle the variable number of modem status octets correctly in
both cases.

Fixes: 7263287af9 ("tty: n_gsm: Fixed logic to decode break signal from modem status")
Cc: stable@vger.kernel.org
Signed-off-by: Daniel Starke <daniel.starke@siemens.com>
Link: https://lore.kernel.org/r/20220218073123.2121-6-daniel.starke@siemens.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
daniel.starke@siemens.com 2022-02-17 23:31:22 -08:00 committed by Greg Kroah-Hartman
parent c19d93542a
commit 687f9ad43c
1 changed files with 14 additions and 9 deletions
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23
drivers/tty/n_gsm.c
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@ -1021,25 +1021,25 @@ static void gsm_control_reply(struct gsm_mux *gsm, int cmd, const u8 *data,
* @tty: virtual tty bound to the DLCI
* @dlci: DLCI to affect
* @modem: modem bits (full EA)
* @clen: command length
* @slen: number of signal octets
*
* Used when a modem control message or line state inline in adaption
* layer 2 is processed. Sort out the local modem state and throttles
*/
static void gsm_process_modem(struct tty_struct *tty, struct gsm_dlci *dlci,
u32 modem, int clen)
u32 modem, int slen)
{
int mlines = 0;
u8 brk = 0;
int fc;
/* The modem status command can either contain one octet (v.24 signals)
or two octets (v.24 signals + break signals). The length field will
either be 2 or 3 respectively. This is specified in section
5.4.6.3.7 of the 27.010 mux spec. */
/* The modem status command can either contain one octet (V.24 signals)
* or two octets (V.24 signals + break signals). This is specified in
* section 5.4.6.3.7 of the 07.10 mux spec.
*/
if (clen == 2)
if (slen == 1)
modem = modem & 0x7f;
else {
brk = modem & 0x7f;
@ -1096,6 +1096,7 @@ static void gsm_control_modem(struct gsm_mux *gsm, const u8 *data, int clen)
unsigned int brk = 0;
struct gsm_dlci *dlci;
int len = clen;
int slen;
const u8 *dp = data;
struct tty_struct *tty;
@ -1115,6 +1116,7 @@ static void gsm_control_modem(struct gsm_mux *gsm, const u8 *data, int clen)
return;
dlci = gsm->dlci[addr];
slen = len;
while (gsm_read_ea(&modem, *dp++) == 0) {
len--;
if (len == 0)
@ -1131,7 +1133,7 @@ static void gsm_control_modem(struct gsm_mux *gsm, const u8 *data, int clen)
modem |= (brk & 0x7f);
}
tty = tty_port_tty_get(&dlci->port);
gsm_process_modem(tty, dlci, modem, clen);
gsm_process_modem(tty, dlci, modem, slen);
if (tty) {
tty_wakeup(tty);
tty_kref_put(tty);
@ -1597,6 +1599,7 @@ static void gsm_dlci_data(struct gsm_dlci *dlci, const u8 *data, int clen)
struct tty_struct *tty;
unsigned int modem = 0;
int len = clen;
int slen = 0;
if (debug & 16)
pr_debug("%d bytes for tty\n", len);
@ -1609,12 +1612,14 @@ static void gsm_dlci_data(struct gsm_dlci *dlci, const u8 *data, int clen)
case 2: /* Asynchronous serial with line state in each frame */
while (gsm_read_ea(&modem, *data++) == 0) {
len--;
slen++;
if (len == 0)
return;
}
slen++;
tty = tty_port_tty_get(port);
if (tty) {
gsm_process_modem(tty, dlci, modem, clen);
gsm_process_modem(tty, dlci, modem, slen);
tty_kref_put(tty);
}
fallthrough;