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tty: Handle problem if line discipline does not have receive_buf
authorGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Sun, 20 Jan 2019 09:46:58 +0000 (10:46 +0100)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 31 Jan 2019 07:12:35 +0000 (08:12 +0100)
commit0609c03246ebb1b83a5b6c6eb3343fe9f08d8c7b
tree5fa8fdf349808dd1e0468dced780eecc632a9e4ctree | snapshot
parentdff6b7b31d650424de0c9fb9038a20f37350a13fcommit | diff
tty: Handle problem if line discipline does not have receive_buf

commit 27cfb3a53be46a54ec5e0bd04e51995b74c90343 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>
drivers/tty/tty_io.c diff | blob | history
wrapfs-5.3.y