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tty: n_gsm: fix malformed counter for out of frame data
commit a24b4b2 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: e1eaea4 ("tty: n_gsm line discipline") Cc: stable@vger.kernel.org Signed-off-by: Daniel Starke <daniel.starke@siemens.com> Link: https://lore.kernel.org/r/20220414094225.4527-7-daniel.starke@siemens.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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