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From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	stable@vger.kernel.org,
	Maciej Falkowski <maciej.falkowski9@gmail.com>,
	Tony Lindgren <tony@atomide.com>, Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.12 18/48] ARM: OMAP1: Fix use of possibly uninitialized irq variable
Date: Wed, 16 Jun 2021 17:33:28 +0200	[thread overview]
Message-ID: <20210616152837.231375273@linuxfoundation.org> (raw)
In-Reply-To: <20210616152836.655643420@linuxfoundation.org>

From: Maciej Falkowski <maciej.falkowski9@gmail.com>

[ Upstream commit 3c4e0147c269738a19c7d70cd32395600bcc0714 ]

The current control flow of IRQ number assignment to `irq` variable
allows a request of IRQ of unspecified value,
generating a warning under Clang compilation with omap1_defconfig on
linux-next:

arch/arm/mach-omap1/pm.c:656:11: warning: variable 'irq' is used
uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
        else if (cpu_is_omap16xx())
                 ^~~~~~~~~~~~~~~~~
./arch/arm/mach-omap1/include/mach/soc.h:123:30: note: expanded from macro
'cpu_is_omap16xx'
                                        ^~~~~~~~~~~~~
arch/arm/mach-omap1/pm.c:658:18: note: uninitialized use occurs here
        if (request_irq(irq, omap_wakeup_interrupt, 0, "peripheral wakeup",
                        ^~~
arch/arm/mach-omap1/pm.c:656:7: note: remove the 'if' if its condition is
always true
        else if (cpu_is_omap16xx())
             ^~~~~~~~~~~~~~~~~~~~~~
arch/arm/mach-omap1/pm.c:611:9: note: initialize the variable 'irq' to
silence this warning
        int irq;
               ^
                = 0
1 warning generated.

The patch provides a default value to the `irq` variable
along with a validity check.

Signed-off-by: Maciej Falkowski <maciej.falkowski9@gmail.com>
Link: https://github.com/ClangBuiltLinux/linux/issues/1324
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 arch/arm/mach-omap1/pm.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/arch/arm/mach-omap1/pm.c b/arch/arm/mach-omap1/pm.c
index 2c1e2b32b9b3..a745d64d4699 100644
--- a/arch/arm/mach-omap1/pm.c
+++ b/arch/arm/mach-omap1/pm.c
@@ -655,9 +655,13 @@ static int __init omap_pm_init(void)
 		irq = INT_7XX_WAKE_UP_REQ;
 	else if (cpu_is_omap16xx())
 		irq = INT_1610_WAKE_UP_REQ;
-	if (request_irq(irq, omap_wakeup_interrupt, 0, "peripheral wakeup",
-			NULL))
-		pr_err("Failed to request irq %d (peripheral wakeup)\n", irq);
+	else
+		irq = -1;
+
+	if (irq >= 0) {
+		if (request_irq(irq, omap_wakeup_interrupt, 0, "peripheral wakeup", NULL))
+			pr_err("Failed to request irq %d (peripheral wakeup)\n", irq);
+	}
 
 	/* Program new power ramp-up time
 	 * (0 for most boards since we don't lower voltage when in deep sleep)
-- 
2.30.2




  parent reply	other threads:[~2021-06-16 15:40 UTC|newest]

Thread overview: 55+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-16 15:33 [PATCH 5.12 00/48] 5.12.12-rc1 review Greg Kroah-Hartman
2021-06-16 15:33 ` [PATCH 5.12 01/48] net: ieee802154: fix null deref in parse dev addr Greg Kroah-Hartman
2021-06-16 15:33 ` [PATCH 5.12 02/48] HID: asus: Filter keyboard EC for old ROG keyboard Greg Kroah-Hartman
2021-06-16 15:33 ` [PATCH 5.12 03/48] HID: quirks: Set INCREMENT_USAGE_ON_DUPLICATE for Saitek X65 Greg Kroah-Hartman
2021-06-16 15:33 ` [PATCH 5.12 04/48] HID: quirks: Add HID_QUIRK_NO_INIT_REPORTS quirk for Dell K15A keyboard-dock Greg Kroah-Hartman
2021-06-16 15:33 ` [PATCH 5.12 05/48] HID: a4tech: use A4_2WHEEL_MOUSE_HACK_B8 for A4TECH NB-95 Greg Kroah-Hartman
2021-06-16 15:33 ` [PATCH 5.12 06/48] HID: hid-input: add mapping for emoji picker key Greg Kroah-Hartman
2021-06-16 15:33 ` [PATCH 5.12 07/48] HID: hid-sensor-hub: Return error for hid_set_field() failure Greg Kroah-Hartman
2021-06-16 15:33 ` [PATCH 5.12 08/48] HID: asus: filter G713/G733 key event to prevent shutdown Greg Kroah-Hartman
2021-06-16 15:33 ` [PATCH 5.12 09/48] HID: quirks: Add quirk for Lenovo optical mouse Greg Kroah-Hartman
2021-06-16 15:33 ` [PATCH 5.12 10/48] HID: multitouch: set Stylus suffix for Stylus-application devices, too Greg Kroah-Hartman
2021-06-16 15:33 ` [PATCH 5.12 11/48] HID: Add BUS_VIRTUAL to hid_connect logging Greg Kroah-Hartman
2021-06-16 15:33 ` [PATCH 5.12 12/48] HID: usbhid: fix info leak in hid_submit_ctrl Greg Kroah-Hartman
2021-06-16 15:33 ` [PATCH 5.12 13/48] mt76: mt7921: fix max aggregation subframes setting Greg Kroah-Hartman
2021-06-16 15:33 ` [PATCH 5.12 14/48] drm/tegra: sor: Do not leak runtime PM reference Greg Kroah-Hartman
2021-06-16 15:33 ` [PATCH 5.12 15/48] gpu: host1x: Split up client initalization and registration Greg Kroah-Hartman
2021-06-16 15:33 ` [PATCH 5.12 16/48] drm/tegra: sor: Fully initialize SOR before registration Greg Kroah-Hartman
2021-06-16 15:33 ` [PATCH 5.12 17/48] hwmon/pmbus: (q54sj108a2) The PMBUS_MFR_ID is actually 6 chars instead of 5 Greg Kroah-Hartman
2021-06-16 15:33 ` Greg Kroah-Hartman [this message]
2021-06-16 15:33 ` [PATCH 5.12 19/48] ARM: OMAP2+: Fix build warning when mmc_omap is not built Greg Kroah-Hartman
2021-06-16 15:33 ` [PATCH 5.12 20/48] gfs2: Prevent direct-I/O write fallback errors from getting lost Greg Kroah-Hartman
2021-06-16 15:33 ` [PATCH 5.12 21/48] gfs2: fix a deadlock on withdraw-during-mount Greg Kroah-Hartman
2021-06-16 15:33 ` [PATCH 5.12 22/48] gfs2: Clean up revokes on normal withdraws Greg Kroah-Hartman
2021-06-16 15:33 ` [PATCH 5.12 23/48] HID: multitouch: Disable event reporting on suspend on the Asus T101HA touchpad Greg Kroah-Hartman
2021-06-16 15:33 ` [PATCH 5.12 24/48] HID: gt683r: add missing MODULE_DEVICE_TABLE Greg Kroah-Hartman
2021-06-16 15:33 ` [PATCH 5.12 25/48] HID: intel-ish-hid: ipc: Add Alder Lake device IDs Greg Kroah-Hartman
2021-06-16 15:33 ` [PATCH 5.12 26/48] riscv: Use -mno-relax when using lld linker Greg Kroah-Hartman
2021-06-16 15:33 ` [PATCH 5.12 27/48] ALSA: hda: Add AlderLake-M PCI ID Greg Kroah-Hartman
2021-06-16 15:33 ` [PATCH 5.12 28/48] mt76: mt7921: remove leftover 80+80 HE capability Greg Kroah-Hartman
2021-06-16 15:33 ` [PATCH 5.12 29/48] gfs2: Fix use-after-free in gfs2_glock_shrink_scan Greg Kroah-Hartman
2021-06-16 15:33 ` [PATCH 5.12 30/48] scsi: target: core: Fix warning on realtime kernels Greg Kroah-Hartman
2021-06-16 15:33 ` [PATCH 5.12 31/48] ethernet: myri10ge: Fix missing error code in myri10ge_probe() Greg Kroah-Hartman
2021-06-16 15:33 ` [PATCH 5.12 32/48] scsi: qedf: Do not put host in qedf_vport_create() unconditionally Greg Kroah-Hartman
2021-06-16 15:33 ` [PATCH 5.12 33/48] Bluetooth: Add a new USB ID for RTL8822CE Greg Kroah-Hartman
2021-06-16 15:33 ` [PATCH 5.12 34/48] scsi: scsi_devinfo: Add blacklist entry for HPE OPEN-V Greg Kroah-Hartman
2021-06-16 15:33 ` [PATCH 5.12 35/48] nvme-loop: reset queue count to 1 in nvme_loop_destroy_io_queues() Greg Kroah-Hartman
2021-06-16 15:33 ` [PATCH 5.12 36/48] nvme-loop: clear NVME_LOOP_Q_LIVE when nvme_loop_configure_admin_queue() fails Greg Kroah-Hartman
2021-06-16 15:33 ` [PATCH 5.12 37/48] nvme-loop: check for NVME_LOOP_Q_LIVE in nvme_loop_destroy_admin_queue() Greg Kroah-Hartman
2021-06-16 15:33 ` [PATCH 5.12 38/48] nvme-loop: do not warn for deleted controllers during reset Greg Kroah-Hartman
2021-06-16 15:33 ` [PATCH 5.12 39/48] net: ipconfig: Dont override command-line hostnames or domains Greg Kroah-Hartman
2021-06-16 15:33 ` [PATCH 5.12 40/48] drm/amd/display: Allow bandwidth validation for 0 streams Greg Kroah-Hartman
2021-06-16 15:33 ` [PATCH 5.12 41/48] drm/amdgpu: refine amdgpu_fru_get_product_info Greg Kroah-Hartman
2021-06-16 15:33 ` [PATCH 5.12 42/48] drm/amd/display: Fix overlay validation by considering cursors Greg Kroah-Hartman
2021-06-16 16:02   ` Harry Wentland
2021-06-16 15:33 ` [PATCH 5.12 43/48] drm/amd/display: Fix potential memory leak in DMUB hw_init Greg Kroah-Hartman
2021-06-16 15:33 ` [PATCH 5.12 44/48] drm/amd/amdgpu:save psp ring wptr to avoid attack Greg Kroah-Hartman
2021-06-16 15:33 ` [PATCH 5.12 45/48] rtnetlink: Fix missing error code in rtnl_bridge_notify() Greg Kroah-Hartman
2021-06-16 15:33 ` [PATCH 5.12 46/48] net/x25: Return the correct errno code Greg Kroah-Hartman
2021-06-16 15:33 ` [PATCH 5.12 47/48] net: " Greg Kroah-Hartman
2021-06-16 15:33 ` [PATCH 5.12 48/48] fib: " Greg Kroah-Hartman
2021-06-16 18:39 ` [PATCH 5.12 00/48] 5.12.12-rc1 review Fox Chen
2021-06-16 22:18 ` Justin Forbes
2021-06-16 22:54 ` Florian Fainelli
2021-06-17  4:57 ` Naresh Kamboju
2021-06-17 21:40 ` Guenter Roeck

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