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pinctrl: single: fix potential NULL dereference in pcs_get_function()

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commit 1c38a62f15 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@vger.kernel.org
Fixes: 571aec4df5 ("pinctrl: single: Use generic pinmux helpers for managing functions")
Signed-off-by: Ma Ke <make24@iscas.ac.cn>
Link: https://lore.kernel.org/20240808041355.2766009-1-make24@iscas.ac.cn
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ma Ke 2024-08-08 12:13:55 +08:00 committed by Greg Kroah-Hartman
parent d80bdfaa48
commit 4ed45fe99e
1 changed files with 2 additions and 0 deletions
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2
drivers/pinctrl/pinctrl-single.c
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@ -349,6 +349,8 @@ static int pcs_get_function(struct pinctrl_dev *pctldev, unsigned pin,
return -ENOTSUPP; return -ENOTSUPP;
fselector = setting->func; fselector = setting->func;
function = pinmux_generic_get_function(pctldev, fselector); function = pinmux_generic_get_function(pctldev, fselector);
if (!function)
return -EINVAL;
*func = function->data; *func = function->data;
if (!(*func)) { if (!(*func)) {
dev_err(pcs->dev, "%s could not find function%i\n", dev_err(pcs->dev, "%s could not find function%i\n",