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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Sasha Levin <sashal@kernel.org>,
	Martin Blumenstingl <martin.blumenstingl@googlemail.com>,
	Remi Pommarel <repk@triplefau.lt>,
	linux-amlogic@lists.infradead.org, linux-clk@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	Jerome Brunet <jbrunet@baylibre.com>
Subject: [PATCH AUTOSEL 5.4 017/459] clk: meson: pll: Fix by 0 division in __pll_params_to_rate()
Date: Fri, 14 Feb 2020 10:54:27 -0500
Message-ID: <20200214160149.11681-17-sashal@kernel.org> (raw)
In-Reply-To: <20200214160149.11681-1-sashal@kernel.org>

From: Remi Pommarel <repk@triplefau.lt>

[ Upstream commit d8488a41800d9f5c80bc0d17b9cc2c91b4841464 ]

Some meson pll registers can be initialized with 0 as N value, introducing
the following division by 0 when computing rate :

  UBSAN: Undefined behaviour in drivers/clk/meson/clk-pll.c:75:9
  division by zero
  CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.4.0-rc3-608075-g86c9af8630e1-dirty #400
  Call trace:
   dump_backtrace+0x0/0x1c0
   show_stack+0x14/0x20
   dump_stack+0xc4/0x100
   ubsan_epilogue+0x14/0x68
   __ubsan_handle_divrem_overflow+0x98/0xb8
   __pll_params_to_rate+0xdc/0x140
   meson_clk_pll_recalc_rate+0x278/0x3a0
   __clk_register+0x7c8/0xbb0
   devm_clk_hw_register+0x54/0xc0
   meson_eeclkc_probe+0xf4/0x1a0
   platform_drv_probe+0x54/0xd8
   really_probe+0x16c/0x438
   driver_probe_device+0xb0/0xf0
   device_driver_attach+0x94/0xa0
   __driver_attach+0x70/0x108
   bus_for_each_dev+0xd8/0x128
   driver_attach+0x30/0x40
   bus_add_driver+0x1b0/0x2d8
   driver_register+0xbc/0x1d0
   __platform_driver_register+0x78/0x88
   axg_driver_init+0x18/0x20
   do_one_initcall+0xc8/0x24c
   kernel_init_freeable+0x2b0/0x344
   kernel_init+0x10/0x128
   ret_from_fork+0x10/0x18

This checks if N is null before doing the division.

Fixes: 7a29a869434e ("clk: meson: Add support for Meson clock controller")
Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Remi Pommarel <repk@triplefau.lt>
[jbrunet@baylibre.com: update the comment in above the fix]
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/clk/meson/clk-pll.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/clk/meson/clk-pll.c b/drivers/clk/meson/clk-pll.c
index ddb1e56347395..3a5853ca98c6c 100644
--- a/drivers/clk/meson/clk-pll.c
+++ b/drivers/clk/meson/clk-pll.c
@@ -77,6 +77,15 @@ static unsigned long meson_clk_pll_recalc_rate(struct clk_hw *hw,
 	unsigned int m, n, frac;
 
 	n = meson_parm_read(clk->map, &pll->n);
+
+	/*
+	 * On some HW, N is set to zero on init. This value is invalid as
+	 * it would result in a division by zero. The rate can't be
+	 * calculated in this case
+	 */
+	if (n == 0)
+		return 0;
+
 	m = meson_parm_read(clk->map, &pll->m);
 
 	frac = MESON_PARM_APPLICABLE(&pll->frac) ?
-- 
2.20.1


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Thread overview: 68+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20200214160149.11681-1-sashal@kernel.org>
2020-02-14 15:54 ` [PATCH AUTOSEL 5.4 009/459] soc: fsl: qe: change return type of cpm_muram_alloc() to s32 Sasha Levin
2020-02-14 15:54 ` [PATCH AUTOSEL 5.4 013/459] crypto: testmgr - don't try to decrypt uninitialized buffers Sasha Levin
2020-02-14 15:54 ` [PATCH AUTOSEL 5.4 015/459] media: meson: add missing allocation failure check on new_buf Sasha Levin
2020-02-14 15:54 ` [PATCH AUTOSEL 5.4 016/459] clk: meson: g12a: fix missing uart2 in regmap table Sasha Levin
2020-02-14 15:54 ` Sasha Levin [this message]
2020-02-14 15:54 ` [PATCH AUTOSEL 5.4 037/459] media: sun4i-csi: Deal with DRAM offset Sasha Levin
2020-02-14 15:54 ` [PATCH AUTOSEL 5.4 038/459] media: sun4i-csi: Fix data sampling polarity handling Sasha Levin
2020-02-14 15:54 ` [PATCH AUTOSEL 5.4 040/459] media: sun4i-csi: Fix [HV]sync " Sasha Levin
2020-02-14 15:54 ` [PATCH AUTOSEL 5.4 041/459] clk: at91: sam9x60: fix programmable clock prescaler Sasha Levin
2020-02-14 15:54 ` [PATCH AUTOSEL 5.4 043/459] clk: meson: meson8b: make the CCF use the glitch-free mali mux Sasha Levin
2020-02-14 15:55 ` [PATCH AUTOSEL 5.4 050/459] arm64: dts: marvell: clearfog-gt-8k: fix switch cpu port node Sasha Levin
2020-02-14 15:55 ` [PATCH AUTOSEL 5.4 064/459] arm64: cpufeature: Fix the type of no FP/SIMD capability Sasha Levin
2020-02-14 15:55 ` [PATCH AUTOSEL 5.4 069/459] clocksource/drivers/bcm2835_timer: Fix memory leak of timer Sasha Levin
2020-02-14 15:55 ` [PATCH AUTOSEL 5.4 079/459] scsi: ufs: Fix ufshcd_probe_hba() reture value in case ufshcd_scsi_add_wlus() fails Sasha Levin
2020-02-14 15:55 ` [PATCH AUTOSEL 5.4 090/459] ARM: 8952/1: Disable kmemleak on XIP kernels Sasha Levin
2020-02-14 15:55 ` [PATCH AUTOSEL 5.4 097/459] drivers: watchdog: stm32_iwdg: set WDOG_HW_RUNNING at probe Sasha Levin
2020-02-14 15:56 ` [PATCH AUTOSEL 5.4 148/459] arm64: dts: rockchip: Fix NanoPC-T4 cooling maps Sasha Levin
2020-02-14 15:56 ` [PATCH AUTOSEL 5.4 150/459] arm64: dts: uDPU: fix broken ethernet Sasha Levin
2020-02-14 15:56 ` [PATCH AUTOSEL 5.4 159/459] arm64: dts: allwinner: H6: Add PMU mode Sasha Levin
2020-02-14 15:56 ` [PATCH AUTOSEL 5.4 160/459] arm64: dts: allwinner: H5: Add PMU node Sasha Levin
2020-02-14 15:56 ` [PATCH AUTOSEL 5.4 161/459] arm: dts: allwinner: H3: " Sasha Levin
2020-02-14 15:56 ` [PATCH AUTOSEL 5.4 163/459] ARM: dts: at91: Reenable UART TX pull-ups Sasha Levin
2020-02-14 15:57 ` [PATCH AUTOSEL 5.4 171/459] clk: imx: Add correct failure handling for clk based helpers Sasha Levin
2020-02-14 15:57 ` [PATCH AUTOSEL 5.4 172/459] ARM: exynos_defconfig: Bring back explicitly wanted options Sasha Levin
2020-02-14 15:57 ` [PATCH AUTOSEL 5.4 173/459] ARM: dts: imx6: rdu2: Disable WP for USDHC2 and USDHC3 Sasha Levin
2020-02-14 15:57 ` [PATCH AUTOSEL 5.4 174/459] ARM: dts: imx6: rdu2: Limit USBH1 to Full Speed Sasha Levin
2020-02-14 15:57 ` [PATCH AUTOSEL 5.4 177/459] PCI: iproc: Apply quirk_paxc_bridge() for module as well as built-in Sasha Levin
2020-02-14 15:57 ` [PATCH AUTOSEL 5.4 190/459] ARM: OMAP2+: pdata-quirks: add PRM data for reset support Sasha Levin
2020-02-14 15:57 ` [PATCH AUTOSEL 5.4 191/459] ARM: OMAP2+: Add workaround for DRA7 DSP MStandby errata i879 Sasha Levin
2020-02-14 18:32   ` Suman Anna
2020-02-14 15:57 ` [PATCH AUTOSEL 5.4 192/459] ARM: OMAP2+: use separate IOMMU pdata to fix DRA7 IPU1 boot Sasha Levin
2020-02-14 18:33   ` Suman Anna
2020-02-14 15:57 ` [PATCH AUTOSEL 5.4 195/459] Revert "tty/serial: atmel: fix out of range clock divider handling" Sasha Levin
2020-02-14 15:57 ` [PATCH AUTOSEL 5.4 212/459] drm/mediatek: handle events when enabling/disabling crtc Sasha Levin
2020-02-14 15:57 ` [PATCH AUTOSEL 5.4 226/459] dmaengine: imx-sdma: Fix memory leak Sasha Levin
2020-02-14 15:58 ` [PATCH AUTOSEL 5.4 232/459] PM / devfreq: exynos-ppmu: Fix excessive stack usage Sasha Levin
2020-02-14 15:58 ` [PATCH AUTOSEL 5.4 237/459] reset: uniphier: Add SCSSI reset control for each channel Sasha Levin
2020-02-14 15:58 ` [PATCH AUTOSEL 5.4 241/459] clk: sunxi-ng: add mux and pll notifiers for A64 CPU clock Sasha Levin
2020-02-14 15:58 ` [PATCH AUTOSEL 5.4 244/459] clk: uniphier: Add SCSSI clock gate for each channel Sasha Levin
2020-02-14 15:58 ` [PATCH AUTOSEL 5.4 261/459] ARM: dts: meson8: use the actual frequency for the GPU's 182.1MHz OPP Sasha Levin
2020-02-14 15:58 ` [PATCH AUTOSEL 5.4 262/459] ARM: dts: meson8b: use the actual frequency for the GPU's 364MHz OPP Sasha Levin
2020-02-14 15:58 ` [PATCH AUTOSEL 5.4 263/459] soc: fsl: qe: remove set but not used variable 'mm_gc' Sasha Levin
2020-02-14 15:58 ` [PATCH AUTOSEL 5.4 265/459] crypto: atmel-sha - fix error handling when setting hmac key Sasha Levin
2020-02-14 15:58 ` [PATCH AUTOSEL 5.4 267/459] ARM: dts: stm32: Add power-supply for DSI panel on stm32f469-disco Sasha Levin
2020-02-14 15:58 ` [PATCH AUTOSEL 5.4 270/459] drm/mediatek: Add gamma property according to hardware capability Sasha Levin
2020-02-14 15:58 ` [PATCH AUTOSEL 5.4 271/459] iommu/arm-smmu-v3: Populate VMID field for CMDQ_OP_TLBI_NH_VA Sasha Levin
2020-02-14 15:58 ` [PATCH AUTOSEL 5.4 277/459] ARM: dts: at91: sama5d3: fix maximum peripheral clock rates Sasha Levin
2020-02-14 15:58 ` [PATCH AUTOSEL 5.4 278/459] ARM: dts: at91: sama5d3: define clock rate range for tcb1 Sasha Levin
2020-02-14 15:58 ` [PATCH AUTOSEL 5.4 281/459] ARM: at91: pm: use SAM9X60 PMC's compatible Sasha Levin
2020-02-14 15:58 ` [PATCH AUTOSEL 5.4 282/459] ARM: at91: pm: use of_device_id array to find the proper shdwc node Sasha Levin
2020-02-14 15:58 ` [PATCH AUTOSEL 5.4 288/459] arm64: dts: rockchip: fix dwmmc clock name for px30 Sasha Levin
2020-02-14 15:58 ` [PATCH AUTOSEL 5.4 289/459] arm64: dts: rockchip: add reg property to brcmf sub-nodes Sasha Levin
2020-02-14 15:59 ` [PATCH AUTOSEL 5.4 290/459] ARM: dts: rockchip: add reg property to brcmf sub node for rk3188-bqedison2qc Sasha Levin
2020-02-14 15:59 ` [PATCH AUTOSEL 5.4 292/459] ASoC: atmel: fix build error with CONFIG_SND_ATMEL_SOC_DMA=m Sasha Levin
2020-02-14 15:59 ` [PATCH AUTOSEL 5.4 299/459] misc: xilinx_sdfec: fix xsdfec_poll()'s return type Sasha Levin
2020-02-15 20:52   ` Dragan Cvetic
2020-02-14 15:59 ` [PATCH AUTOSEL 5.4 305/459] arm64: cpufeature: Set the FP/SIMD compat HWCAP bits properly Sasha Levin
2020-02-14 15:59 ` [PATCH AUTOSEL 5.4 306/459] arm64: ptrace: nofpsimd: Fail FP/SIMD regset operations Sasha Levin
2020-02-14 15:59 ` [PATCH AUTOSEL 5.4 317/459] perf/imx_ddr: Fix cpu hotplug state cleanup Sasha Levin
2020-02-14 15:59 ` [PATCH AUTOSEL 5.4 322/459] iommu/arm-smmu-v3: Use WRITE_ONCE() when changing validity of an STE Sasha Levin
2020-02-14 15:59 ` [PATCH AUTOSEL 5.4 327/459] scsi: ufs: pass device information to apply_dev_quirks Sasha Levin
2020-02-14 15:59 ` [PATCH AUTOSEL 5.4 328/459] scsi: ufs-mediatek: add apply_dev_quirks variant operation Sasha Levin
2020-02-14 15:59 ` [PATCH AUTOSEL 5.4 334/459] arm64: lse: fix LSE atomics with LLVM's integrated assembler Sasha Levin
2020-02-14 15:59 ` [PATCH AUTOSEL 5.4 335/459] arm64: fix alternatives " Sasha Levin
2020-02-14 15:59 ` [PATCH AUTOSEL 5.4 342/459] arm64: dts: ti: k3-j721e-main: Add missing power-domains for smmu Sasha Levin
2020-02-14 15:59 ` [PATCH AUTOSEL 5.4 347/459] ACPI/IORT: Fix 'Number of IDs' handling in iort_id_map() Sasha Levin
2020-02-14 16:00 ` [PATCH AUTOSEL 5.4 402/459] ARM: 8949/1: mm: mark free_memmap as __init Sasha Levin
2020-02-14 16:00 ` [PATCH AUTOSEL 5.4 403/459] ARM: 8951/1: Fix Kexec compilation issue Sasha Levin

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