[PATCH 5.10 124/151] pinctrl: single: fix potential NULL dereference in pcs_get_function()

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5.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ma Ke <make24@xxxxxxxxxxx>

commit 1c38a62f15e595346a1106025722869e87ffe044 upstream.

pinmux_generic_get_function() can return NULL and the pointer 'function'
was dereferenced without checking against NULL. Add checking of pointer
'function' in pcs_get_function().

Found by code review.

Cc: stable@xxxxxxxxxxxxxxx
Fixes: 571aec4df5b7 ("pinctrl: single: Use generic pinmux helpers for managing functions")
Signed-off-by: Ma Ke <make24@xxxxxxxxxxx>
Link: https://lore.kernel.org/20240808041355.2766009-1-make24@xxxxxxxxxxx
Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/pinctrl/pinctrl-single.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/pinctrl/pinctrl-single.c
+++ b/drivers/pinctrl/pinctrl-single.c
@@ -350,6 +350,8 @@ static int pcs_get_function(struct pinct
 		return -ENOTSUPP;
 	fselector = setting->func;
 	function = pinmux_generic_get_function(pctldev, fselector);
+	if (!function)
+		return -EINVAL;
 	*func = function->data;
 	if (!(*func)) {
 		dev_err(pcs->dev, "%s could not find function%i\n",






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