5.4-stable review patch. If anyone has any objections, please let me know.
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From: Bartosz Golaszewski bartosz.golaszewski@linaro.org
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 --- drivers/pinctrl/pinmux.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/pinctrl/pinmux.c +++ b/drivers/pinctrl/pinmux.c @@ -324,7 +324,7 @@ static int pinmux_func_name_to_selector( while (selector < nfuncs) { const char *fname = ops->get_function_name(pctldev, selector);
- if (!strcmp(function, fname)) + if (fname && !strcmp(function, fname)) return selector;
selector++;