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Date: Thu, 17 Nov 2022 15:30:34 +0300 From: Maxim Korotkov <korotkov.maxim.s@...il.com> To: Tony Lindgren <tony@...mide.com> Cc: Maxim Korotkov <korotkov.maxim.s@...il.com>, Haojian Zhuang <haojian.zhuang@...aro.org>, Linus Walleij <linus.walleij@...aro.org>, "Manjunathappa, Prakash" <prakash.pm@...com>, linux-arm-kernel@...ts.infradead.org, linux-omap@...r.kernel.org, linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org, lvc-project@...uxtesting.org Subject: [PATCH] pinctrl: single: Fix potential division by zero There is a possibility of dividing by zero due to the pcs->bits_per_pin if pcs->fmask() also has a value of zero and called fls from asm-generic/bitops/builtin-fls.h or arch/x86/include/asm/bitops.h. The function pcs_probe() has the branch that assigned to fmask 0 before pcs_allocate_pin_table() was called Found by Linux Verification Center (linuxtesting.org) with SVACE. Fixes: 4e7e8017a80e ("pinctrl: pinctrl-single: enhance to configure multiple pins of different modules") Signed-off-by: Maxim Korotkov <korotkov.maxim.s@...il.com> --- drivers/pinctrl/pinctrl-single.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/pinctrl/pinctrl-single.c b/drivers/pinctrl/pinctrl-single.c index 67bec7ea0f8b..414ee6bb8ac9 100644 --- a/drivers/pinctrl/pinctrl-single.c +++ b/drivers/pinctrl/pinctrl-single.c @@ -727,7 +727,7 @@ static int pcs_allocate_pin_table(struct pcs_device *pcs) mux_bytes = pcs->width / BITS_PER_BYTE; - if (pcs->bits_per_mux) { + if (pcs->bits_per_mux && pcs->fmask) { pcs->bits_per_pin = fls(pcs->fmask); nr_pins = (pcs->size * BITS_PER_BYTE) / pcs->bits_per_pin; } else { -- 2.17.1
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