pinctrl: avoid unsafe code pattern in find_pinctrl()

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commit c153a4edff upstream.

The code in find_pinctrl() takes a mutex and traverses a list of pinctrl
structures. Later the caller bumps up reference count on the found
structure. Such pattern is not safe as pinctrl that was found may get
deleted before the caller gets around to increasing the reference count.

Fix this by taking the reference count in find_pinctrl(), while it still
holds the mutex.

Cc: stable@vger.kernel.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Link: https://lore.kernel.org/r/ZQs1RgTKg6VJqmPs@google.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Dmitry Torokhov 2023-09-20 11:09:10 -07:00 • committed by Greg Kroah-Hartman

parent d67b5a2b97

commit 97306abdea

1 changed files with 9 additions and 7 deletions

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drivers/pinctrl/core.c

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