kgdboc: Fix tty driver reference leak in configure_kgdboc()

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tty_find_polling_driver() returns the tty driver with an extra
reference taken by tty_driver_kref_get(). configure_kgdboc() stores it
in kgdb_tty_driver but the reference is never dropped: it is leaked when
kgdb_register_io_module() fails, when the configuration is cleared, and
on every reconfigure.

Release the reference both when unconfiguring and on the error path.

Fixes: 7d7b93c145 ("tty: kref the tty driver object")
Cc: stable@kernel.org
Signed-off-by: Wentao Liang <vulab@iscas.ac.cn>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Link: https://patch.msgid.link/20260917155523.2161202-1-vulab@iscas.ac.cn
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Wentao Liang 2026-09-17 15:55:23 +00:00 • committed by Greg Kroah-Hartman

parent 98401cf912

commit ef3134cd0d

1 changed files with 9 additions and 0 deletions

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drivers/tty/serial/kgdboc.c

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