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pinctrl: single: fix potential NULL dereference

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[ Upstream commit d2d73e6d4822140445ad4a7b1c6091e0f5fe703b ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Maxim Korotkov 2022-11-18 13:43:32 +03:00 committed by Greg Kroah-Hartman
parent cc1affa234
commit 2b763f7de1
1 changed files with 2 additions and 0 deletions
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2
drivers/pinctrl/pinctrl-single.c
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@ -345,6 +345,8 @@ 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;