From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Jens Axboe <axboe@kernel.dk>, Daniel Scally <djrscally@gmail.com>,
Andy Shevchenko <andy.shevchenko@gmail.com>,
Sasha Levin <sashal@kernel.org>,
linux-acpi@vger.kernel.org, devel@acpica.org
Subject: [PATCH AUTOSEL 5.13 21/21] ACPI: fix NULL pointer dereference
Date: Tue, 27 Jul 2021 09:19:08 -0400 [thread overview]
Message-ID: <20210727131908.834086-21-sashal@kernel.org> (raw)
In-Reply-To: <20210727131908.834086-1-sashal@kernel.org>
From: Linus Torvalds <torvalds@linux-foundation.org>
[ Upstream commit fc68f42aa737dc15e7665a4101d4168aadb8e4c4 ]
Commit 71f642833284 ("ACPI: utils: Fix reference counting in
for_each_acpi_dev_match()") started doing "acpi_dev_put()" on a pointer
that was possibly NULL. That fails miserably, because that helper
inline function is not set up to handle that case.
Just make acpi_dev_put() silently accept a NULL pointer, rather than
calling down to put_device() with an invalid offset off that NULL
pointer.
Link: https://lore.kernel.org/lkml/a607c149-6bf6-0fd0-0e31-100378504da2@kernel.dk/
Reported-and-tested-by: Jens Axboe <axboe@kernel.dk>
Tested-by: Daniel Scally <djrscally@gmail.com>
Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
include/acpi/acpi_bus.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index 3a82faac5767..cd98af6ba155 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -716,7 +716,8 @@ static inline struct acpi_device *acpi_dev_get(struct acpi_device *adev)
static inline void acpi_dev_put(struct acpi_device *adev)
{
- put_device(&adev->dev);
+ if (adev)
+ put_device(&adev->dev);
}
#else /* CONFIG_ACPI */
--
2.30.2
prev parent reply other threads:[~2021-07-27 13:31 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-27 13:18 [PATCH AUTOSEL 5.13 01/21] regulator: rtmv20: Fix wrong mask for strobe-polarity-high Sasha Levin
2021-07-27 13:18 ` [PATCH AUTOSEL 5.13 02/21] regulator: rt5033: Fix n_voltages settings for BUCK and LDO Sasha Levin
2021-07-27 13:18 ` [PATCH AUTOSEL 5.13 03/21] spi: stm32h7: fix full duplex irq handler handling Sasha Levin
2021-07-27 13:18 ` [PATCH AUTOSEL 5.13 04/21] ASoC: tlv320aic31xx: fix reversed bclk/wclk master bits Sasha Levin
2021-07-27 13:18 ` [PATCH AUTOSEL 5.13 05/21] regulator: mtk-dvfsrc: Fix wrong dev pointer for devm_regulator_register Sasha Levin
2021-07-27 13:18 ` [PATCH AUTOSEL 5.13 06/21] USB: core: Fix incorrect pipe calculation in do_proc_control() Sasha Levin
2021-07-27 13:28 ` Greg Kroah-Hartman
2021-07-27 18:54 ` Sasha Levin
2021-07-27 13:18 ` [PATCH AUTOSEL 5.13 07/21] r8152: Fix potential PM refcount imbalance Sasha Levin
2021-07-27 13:18 ` [PATCH AUTOSEL 5.13 08/21] r8152: Fix a deadlock by doubly PM resume Sasha Levin
2021-07-27 13:18 ` [PATCH AUTOSEL 5.13 09/21] qed: fix possible unpaired spin_{un}lock_bh in _qed_mcp_cmd_and_union() Sasha Levin
2021-07-27 13:30 ` Justin He
2021-07-27 18:54 ` Sasha Levin
2021-07-27 13:18 ` [PATCH AUTOSEL 5.13 10/21] ASoC: rt5682: Fix the issue of garbled recording after powerd_dbus_suspend Sasha Levin
2021-07-27 13:18 ` [PATCH AUTOSEL 5.13 11/21] mt7530 fix mt7530_fdb_write vid missing ivl bit Sasha Levin
2021-07-27 13:18 ` [PATCH AUTOSEL 5.13 12/21] net: Fix zero-copy head len calculation Sasha Levin
2021-07-27 13:19 ` [PATCH AUTOSEL 5.13 13/21] ASoC: ti: j721e-evm: Fix unbalanced domain activity tracking during startup Sasha Levin
2021-07-27 13:19 ` [PATCH AUTOSEL 5.13 14/21] ASoC: ti: j721e-evm: Check for not initialized parent_clk_id Sasha Levin
2021-07-27 13:19 ` [PATCH AUTOSEL 5.13 15/21] efi/mokvar: Reserve the table only if it is in boot services data Sasha Levin
2021-07-27 13:19 ` [PATCH AUTOSEL 5.13 16/21] nvme: fix nvme_setup_command metadata trace event Sasha Levin
2021-07-27 13:19 ` [PATCH AUTOSEL 5.13 17/21] drm/amd/display: Fix comparison error in dcn21 DML Sasha Levin
2021-07-27 13:19 ` [PATCH AUTOSEL 5.13 18/21] drm/amd/display: Fix max vstartup calculation for modes with borders Sasha Levin
2021-07-27 13:19 ` [PATCH AUTOSEL 5.13 19/21] io_uring: never attempt iopoll reissue from release path Sasha Levin
2021-07-27 13:19 ` [PATCH AUTOSEL 5.13 20/21] io_uring: explicitly catch any illegal async queue attempt Sasha Levin
2021-07-27 13:19 ` Sasha Levin [this message]
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