tty: fix compat TIOCGSERIAL checking wrong function ptr
Commit 77654350 ("take compat TIOC[SG]SERIAL treatment into tty_compat_ioctl()") changed the compat version of TIOCGSERIAL to start checking for the presence of the ->set_serial function pointer rather than ->get_serial. This appears to be a copy-and-paste error, since ->get_serial is the function pointer that is called as well as the pointer that is checked by the non-compat version of TIOCGSERIAL. Fix this by checking the correct function pointer. Fixes: 77654350 ("take compat TIOC[SG]SERIAL treatment into tty_compat_ioctl()") Cc: <stable@vger.kernel.org> # v4.20+ Signed-off-by: NEric Biggers <ebiggers@google.com> Acked-by: NJiri Slaby <jslaby@suse.cz> Link: https://lore.kernel.org/r/20200224182044.234553-3-ebiggers@kernel.orgSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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