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pinctrl: th1520: Fix potential null pointer dereference on func

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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: 1fc30cd927 ("pinctrl: th1520: Factor out casts")
Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Reported-by: Kees Bakker <kees@ijzerbout.nl>
Acked-by: Drew Fustini <dfustini@tenstorrent.com>
Link: https://lore.kernel.org/20241016155655.334518-1-colin.i.king@gmail.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Colin Ian King 2024-10-16 16:56:55 +01:00 committed by Linus Walleij
parent 22c918258f
commit 05214b06ee
1 changed files with 2 additions and 1 deletions
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3
drivers/pinctrl/pinctrl-th1520.c
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@ -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);