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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>,
	Jakub Kicinski <jakub.kicinski@netronome.com>,
	Antonio Borneo <antonio.borneo@st.com>,
	netdev@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com,
	linux-arm-kernel@lists.infradead.org
Subject: [PATCH AUTOSEL 4.9 214/251] net: stmmac: fix length of PTP clock's name string
Date: Thu, 16 Jan 2020 12:36:03 -0500
Message-ID: <20200116173641.22137-174-sashal@kernel.org> (raw)
In-Reply-To: <20200116173641.22137-1-sashal@kernel.org>

From: Antonio Borneo <antonio.borneo@st.com>

[ Upstream commit 5da202c88f8c355ad79bc2e8eb582e6d433060e7 ]

The field "name" in struct ptp_clock_info has a fixed size of 16
chars and is used as zero terminated string by clock_name_show()
in drivers/ptp/ptp_sysfs.c
The current initialization value requires 17 chars to fit also the
null termination, and this causes overflow to the next bytes in
the struct when the string is read as null terminated:
	hexdump -C /sys/class/ptp/ptp0/clock_name
	00000000  73 74 6d 6d 61 63 5f 70  74 70 5f 63 6c 6f 63 6b  |stmmac_ptp_clock|
	00000010  a0 ac b9 03 0a                                    |.....|
where the extra 4 bytes (excluding the newline) after the string
represent the integer 0x03b9aca0 = 62500000 assigned to the field
"max_adj" that follows "name" in the same struct.

There is no strict requirement for the "name" content and in the
comment in ptp_clock_kernel.h it's reported it should just be 'A
short "friendly name" to identify the clock'.
Replace it with "stmmac ptp".

Signed-off-by: Antonio Borneo <antonio.borneo@st.com>
Fixes: 92ba6888510c ("stmmac: add the support for PTP hw clock driver")
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.c
index 3eb281d1db08..231330809037 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_ptp.c
@@ -158,7 +158,7 @@ static int stmmac_enable(struct ptp_clock_info *ptp,
 /* structure describing a PTP hardware clock */
 static struct ptp_clock_info stmmac_ptp_clock_ops = {
 	.owner = THIS_MODULE,
-	.name = "stmmac_ptp_clock",
+	.name = "stmmac ptp",
 	.max_adj = 62500000,
 	.n_alarm = 0,
 	.n_ext_ts = 0,
-- 
2.20.1


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Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-16 17:33 [PATCH AUTOSEL 4.9 041/251] media: s5p-jpeg: Correct step and max values for V4L2_CID_JPEG_RESTART_INTERVAL Sasha Levin
2020-01-16 17:33 ` [PATCH AUTOSEL 4.9 043/251] ASoC: imx-sgtl5000: put of nodes if finding codec fails Sasha Levin
2020-01-16 17:33 ` [PATCH AUTOSEL 4.9 046/251] clk: sunxi-ng: sun8i-a23: Enable PLL-MIPI LDOs when ungating it Sasha Levin
2020-01-16 17:33 ` [PATCH AUTOSEL 4.9 050/251] ARM: dts: lpc32xx: add required clocks property to keypad device node Sasha Levin
2020-01-16 17:33 ` [PATCH AUTOSEL 4.9 051/251] ARM: dts: lpc32xx: reparent keypad controller to SIC1 Sasha Levin
2020-01-16 17:33 ` [PATCH AUTOSEL 4.9 052/251] ARM: dts: lpc32xx: fix ARM PrimeCell LCD controller variant Sasha Levin
2020-01-16 17:33 ` [PATCH AUTOSEL 4.9 053/251] ARM: dts: lpc32xx: fix ARM PrimeCell LCD controller clocks property Sasha Levin
2020-01-16 17:33 ` [PATCH AUTOSEL 4.9 054/251] ARM: dts: lpc32xx: phy3250: fix SD card regulator voltage Sasha Levin
2020-01-16 17:33 ` [PATCH AUTOSEL 4.9 058/251] thermal: mediatek: fix register index error Sasha Levin
2020-01-16 17:33 ` [PATCH AUTOSEL 4.9 085/251] clocksource/drivers/sun5i: Fail gracefully when clock rate is unavailable Sasha Levin
2020-01-16 17:33 ` [PATCH AUTOSEL 4.9 086/251] clocksource/drivers/exynos_mct: Fix error path in timer resources initialization Sasha Levin
2020-01-16 17:33 ` [PATCH AUTOSEL 4.9 087/251] mmc: sdhci-brcmstb: handle mmc_of_parse() errors during probe Sasha Levin
2020-01-16 17:33 ` [PATCH AUTOSEL 4.9 088/251] ARM: 8847/1: pm: fix HYP/SVC mode mismatch when MCPM is used Sasha Levin
2020-01-16 17:33 ` [PATCH AUTOSEL 4.9 089/251] ARM: 8848/1: virt: Align GIC version check with arm64 counterpart Sasha Levin
2020-01-16 17:34 ` [PATCH AUTOSEL 4.9 104/251] ARM: OMAP2+: Fix potentially uninitialized return value for _setup_reset() Sasha Levin
2020-01-16 17:34 ` [PATCH AUTOSEL 4.9 110/251] soc/fsl/qe: Fix an error code in qe_pin_request() Sasha Levin
2020-01-16 17:34 ` [PATCH AUTOSEL 4.9 111/251] spi: bcm2835aux: fix driver to not allow 65535 (=-1) cs-gpios Sasha Levin
2020-01-16 17:34 ` [PATCH AUTOSEL 4.9 114/251] ARM: pxa: ssp: Fix "WARNING: invalid free of devm_ allocated data" Sasha Levin
2020-01-16 17:34 ` [PATCH AUTOSEL 4.9 118/251] ARM: dts: ls1021: Fix SGMII PCS link remaining down after PHY disconnect Sasha Levin
2020-01-16 17:34 ` [PATCH AUTOSEL 4.9 138/251] pwm: meson: Don't disable PWM when setting duty repeatedly Sasha Levin
2020-01-16 17:34 ` [PATCH AUTOSEL 4.9 139/251] ARM: riscpc: fix lack of keyboard interrupts after irq conversion Sasha Levin
2020-01-16 17:34 ` [PATCH AUTOSEL 4.9 146/251] serial: stm32: fix transmit_chars when tx is stopped Sasha Levin
2020-01-16 17:35 ` [PATCH AUTOSEL 4.9 184/251] ASoC: sun4i-i2s: RX and TX counter registers are swapped Sasha Levin
2020-01-16 17:35 ` [PATCH AUTOSEL 4.9 205/251] net: stmmac: dwmac-meson8b: Fix signedness bug in probe Sasha Levin
2020-01-16 17:35 ` [PATCH AUTOSEL 4.9 207/251] net: ethernet: stmmac: Fix signedness bug in ipq806x_gmac_of_parse() Sasha Levin
2020-01-16 17:35 ` [PATCH AUTOSEL 4.9 210/251] net: stmmac: gmac4+: Not all Unicast addresses may be available Sasha Levin
2020-01-16 17:36 ` Sasha Levin [this message]
2020-01-16 17:36 ` [PATCH AUTOSEL 4.9 218/251] dmaengine: imx-sdma: fix size check for sdma script_number Sasha Levin
2020-01-16 17:36 ` [PATCH AUTOSEL 4.9 224/251] mt7601u: fix bbp version check in mt7601u_wait_bbp_ready Sasha Levin
2020-01-16 17:36 ` [PATCH AUTOSEL 4.9 229/251] spi: atmel: fix handling of cs_change set on non-last xfer Sasha Levin
2020-01-16 17:36 ` [PATCH AUTOSEL 4.9 232/251] clk: samsung: exynos5420: Preserve CPU clocks configuration during suspend/resume Sasha Levin
2020-01-16 17:36 ` [PATCH AUTOSEL 4.9 235/251] media: exynos4-is: Fix recursive locking in isp_video_release() Sasha Levin
2020-01-16 17:36 ` [PATCH AUTOSEL 4.9 240/251] tty: serial: imx: use the sg count from dma_map_sg Sasha Levin
2020-01-16 17:36 ` [PATCH AUTOSEL 4.9 249/251] arm64: dts: juno: Fix UART frequency Sasha Levin

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