From d2d73e6d4822140445ad4a7b1c6091e0f5fe703b Mon Sep 17 00:00:00 2001
From: Maxim Korotkov <korotkov.maxim.s@gmail.com>
Date: Fri, 18 Nov 2022 13:43:32 +0300
Subject: [PATCH] pinctrl: single: fix potential NULL dereference
Git-commit: d2d73e6d4822140445ad4a7b1c6091e0f5fe703b
Patch-mainline: v6.2-rc8
References: git-fixes
Added checking of pointer "function" in pcs_set_mux().
pinmux_generic_get_function() can return NULL and the pointer
"function" was dereferenced without checking against NULL.
Found by Linux Verification Center (linuxtesting.org) with SVACE.
Fixes: 571aec4df5b7 ("pinctrl: single: Use generic pinmux helpers for managing functions")
Signed-off-by: Maxim Korotkov <korotkov.maxim.s@gmail.com>
Reviewed-by: Tony Lindgren <tony@atomide.com>
Link: https://lore.kernel.org/r/20221118104332.943-1-korotkov.maxim.s@gmail.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/pinctrl/pinctrl-single.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/pinctrl/pinctrl-single.c b/drivers/pinctrl/pinctrl-single.c
index 99c3745da456..190923757cda 100644
--- a/drivers/pinctrl/pinctrl-single.c
+++ b/drivers/pinctrl/pinctrl-single.c
@@ -372,6 +372,8 @@ static int pcs_set_mux(struct pinctrl_dev *pctldev, unsigned fselector,
if (!pcs->fmask)
return 0;
function = pinmux_generic_get_function(pctldev, fselector);
+ if (!function)
+ return -EINVAL;
func = function->data;
if (!func)
return -EINVAL;
--
2.35.3