[PATCH v5 05/10] tty: n_gsm: increase malformed counter for malformed control frames

From: D. Starke
Date: Wed May 17 2023 - 11:58:59 EST


From: Daniel Starke <daniel.starke@xxxxxxxxxxx>

The malformed counter in gsm_mux is already increased in case of errors
detected in gsm_queue() and gsm1_receive(). gsm_dlci_command() also
detects a case for a malformed frame but does not increase the malformed
counter yet.

Fix this by also increasing the gsm_mux malformed counter in case of a
malformed frame in gsm_dlci_command().
Note that the malformed counter is not yet exposed and only set internally.

Signed-off-by: Daniel Starke <daniel.starke@xxxxxxxxxxx>
---
drivers/tty/n_gsm.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

v4 -> v5:
No changes.

Please note that I cannot response to emails until August 7th. Felix Haase
will take over from our side for questions regarding this patch series or
the n_gsm.

Link: https://lore.kernel.org/all/20230426080315.7595-5-daniel.starke@xxxxxxxxxxx/

diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c
index 186f463f0f11..5b6a03668c78 100644
--- a/drivers/tty/n_gsm.c
+++ b/drivers/tty/n_gsm.c
@@ -2455,8 +2455,10 @@ static void gsm_dlci_command(struct gsm_dlci *dlci, const u8 *data, int len)
data += dlen;

/* Malformed command? */
- if (clen > len)
+ if (clen > len) {
+ dlci->gsm->malformed++;
return;
+ }

if (command & 1)
gsm_control_message(dlci->gsm, command, data, clen);
--
2.34.1