From: Daniel Starke Date: Thu, 14 Apr 2022 09:42:12 +0000 (-0700) Subject: tty: n_gsm: fix malformed counter for out of frame data X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=da0fc1a6f2ea9068568b97d37d7faea3c8c65078;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git tty: n_gsm: fix malformed counter for out of frame data commit a24b4b2f660b7ddf3f484b37600bba382cb28a9d upstream. The gsm_mux field 'malformed' represents the number of malformed frames received. However, gsm1_receive() also increases this counter for any out of frame byte. Fix this by ignoring out of frame data for the malformed counter. Fixes: e1eaea46bb40 ("tty: n_gsm line discipline") Cc: stable@vger.kernel.org Signed-off-by: Daniel Starke Link: https://lore.kernel.org/r/20220414094225.4527-7-daniel.starke@siemens.com Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c index bee92cd3f90a..cbeb8907a6cf 100644 --- a/drivers/tty/n_gsm.c +++ b/drivers/tty/n_gsm.c @@ -1973,7 +1973,8 @@ static void gsm1_receive(struct gsm_mux *gsm, unsigned char c) } /* Any partial frame was a runt so go back to start */ if (gsm->state != GSM_START) { - gsm->malformed++; + if (gsm->state != GSM_SEARCH) + gsm->malformed++; gsm->state = GSM_START; } /* A SOF in GSM_START means we are still reading idling or