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pinctrl: check the return value of pinmux_ops::get_function_name()

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commit 4002ee98c022d671ecc1e4a84029e9ae7d8a5603 upstream.

While the API contract in docs doesn't specify it explicitly, the
generic implementation of the get_function_name() callback from struct
pinmux_ops - pinmux_generic_get_function_name() - can fail and return
NULL. This is already checked in pinmux_check_ops() so add a similar
check in pinmux_func_name_to_selector() instead of passing the returned
pointer right down to strcmp() where the NULL can get dereferenced. This
is normal operation when adding new pinfunctions.

Cc: stable@vger.kernel.org
Tested-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Bartosz Golaszewski 2025-09-02 13:59:10 +02:00 committed by Greg Kroah-Hartman
parent 66821fdb72
commit 1a2ea887a5
1 changed files with 1 additions and 1 deletions
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2
drivers/pinctrl/pinmux.c
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@ -339,7 +339,7 @@ static int pinmux_func_name_to_selector(struct pinctrl_dev *pctldev,
while (selector < nfuncs) {
const char *fname = ops->get_function_name(pctldev, selector);
if (!strcmp(function, fname))
if (fname && !strcmp(function, fname))
return selector;
selector++;