From: Colin Ian King Date: Wed, 16 Oct 2024 15:56:55 +0000 (+0100) Subject: pinctrl: th1520: Fix potential null pointer dereference on func X-Git-Tag: microblaze-v6.16~549^2~42 X-Git-Url: http://git.monstr.eu/?a=commitdiff_plain;h=05214b06ee832854bfae883de0522e3c48d4444b;p=linux-2.6-microblaze.git pinctrl: th1520: Fix potential null pointer dereference on func The initialization of muxtype deferences pointer func before func is sanity checked with a null pointer check, hence we have a null pointer deference issue. Fix this by only deferencing func with the assignment to muxtype after func has been null pointer checked. Fixes: 1fc30cd92770 ("pinctrl: th1520: Factor out casts") Signed-off-by: Colin Ian King Reported-by: Kees Bakker Acked-by: Drew Fustini Link: https://lore.kernel.org/20241016155655.334518-1-colin.i.king@gmail.com Signed-off-by: Linus Walleij --- diff --git a/drivers/pinctrl/pinctrl-th1520.c b/drivers/pinctrl/pinctrl-th1520.c index 7474d8da32f9..e641bad6728c 100644 --- a/drivers/pinctrl/pinctrl-th1520.c +++ b/drivers/pinctrl/pinctrl-th1520.c @@ -803,11 +803,12 @@ static int th1520_pinmux_set_mux(struct pinctrl_dev *pctldev, { struct th1520_pinctrl *thp = pinctrl_dev_get_drvdata(pctldev); const struct function_desc *func = pinmux_generic_get_function(pctldev, fsel); - enum th1520_muxtype muxtype = (uintptr_t)func->data; + enum th1520_muxtype muxtype; if (!func) return -EINVAL; + muxtype = (uintptr_t)func->data; return th1520_pinmux_set(thp, thp->desc.pins[gsel].number, th1520_pad_muxdata(thp->desc.pins[gsel].drv_data), muxtype);