tty: Handle problem if line discipline does not have receive_buf

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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>

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This commit is contained in:

Greg Kroah-Hartman 2019-01-20 10:46:58 +01:00

parent 65295fb933

commit dcbf6a1314

1 changed files with 2 additions and 1 deletions

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drivers/tty/tty_io.c

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