Greg Kroah-Hartman dcbf6a1314 tty: Handle problem if line discipline does not have receive_buf ...

commit 27cfb3a53b upstream.

Some tty line disciplines do not have a receive buf callback, so
properly check for that before calling it.  If they do not have this
callback, just eat the character quietly, as we can't fail this call.

Reported-by: Jann Horn <jannh@google.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2019-01-31 08:15:39 +01:00

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