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* [PATCH AUTOSEL 6.3 01/37] power: supply: ab8500: Fix external_power_changed race
@ 2023-05-31 13:39 Sasha Levin
  2023-05-31 13:39 ` [PATCH AUTOSEL 6.3 02/37] power: supply: sc27xx: " Sasha Levin
                   ` (35 more replies)
  0 siblings, 36 replies; 39+ messages in thread
From: Sasha Levin @ 2023-05-31 13:39 UTC (permalink / raw)
  To: linux-kernel, stable
  Cc: Hans de Goede, Linus Walleij, Sebastian Reichel, Sasha Levin, sre,
	linux-pm

From: Hans de Goede <hdegoede@redhat.com>

[ Upstream commit a5299ce4e96f3e8930e9c051b28d8093ada87b08 ]

ab8500_btemp_external_power_changed() dereferences di->btemp_psy,
which gets sets in ab8500_btemp_probe() like this:

        di->btemp_psy = devm_power_supply_register(dev, &ab8500_btemp_desc,
                                                   &psy_cfg);

As soon as devm_power_supply_register() has called device_add()
the external_power_changed callback can get called. So there is a window
where ab8500_btemp_external_power_changed() may get called while
di->btemp_psy has not been set yet leading to a NULL pointer dereference.

Fixing this is easy. The external_power_changed callback gets passed
the power_supply which will eventually get stored in di->btemp_psy,
so ab8500_btemp_external_power_changed() can simply directly use
the passed in psy argument which is always valid.

And the same applies to ab8500_fg_external_power_changed().

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/power/supply/ab8500_btemp.c | 6 ++----
 drivers/power/supply/ab8500_fg.c    | 6 ++----
 2 files changed, 4 insertions(+), 8 deletions(-)

diff --git a/drivers/power/supply/ab8500_btemp.c b/drivers/power/supply/ab8500_btemp.c
index 307ee6f71042e..6f83e99d2eb72 100644
--- a/drivers/power/supply/ab8500_btemp.c
+++ b/drivers/power/supply/ab8500_btemp.c
@@ -624,10 +624,8 @@ static int ab8500_btemp_get_ext_psy_data(struct device *dev, void *data)
  */
 static void ab8500_btemp_external_power_changed(struct power_supply *psy)
 {
-	struct ab8500_btemp *di = power_supply_get_drvdata(psy);
-
-	class_for_each_device(power_supply_class, NULL,
-		di->btemp_psy, ab8500_btemp_get_ext_psy_data);
+	class_for_each_device(power_supply_class, NULL, psy,
+			      ab8500_btemp_get_ext_psy_data);
 }
 
 /* ab8500 btemp driver interrupts and their respective isr */
diff --git a/drivers/power/supply/ab8500_fg.c b/drivers/power/supply/ab8500_fg.c
index 41a7bff9ac376..53560fbb6dcd3 100644
--- a/drivers/power/supply/ab8500_fg.c
+++ b/drivers/power/supply/ab8500_fg.c
@@ -2407,10 +2407,8 @@ static int ab8500_fg_init_hw_registers(struct ab8500_fg *di)
  */
 static void ab8500_fg_external_power_changed(struct power_supply *psy)
 {
-	struct ab8500_fg *di = power_supply_get_drvdata(psy);
-
-	class_for_each_device(power_supply_class, NULL,
-		di->fg_psy, ab8500_fg_get_ext_psy_data);
+	class_for_each_device(power_supply_class, NULL, psy,
+			      ab8500_fg_get_ext_psy_data);
 }
 
 /**
-- 
2.39.2


^ permalink raw reply related	[flat|nested] 39+ messages in thread
* [PATCH AUTOSEL 6.3 01/37] power: supply: ab8500: Fix external_power_changed race
@ 2023-06-15 11:36 Sasha Levin
  2023-06-15 11:36 ` [PATCH AUTOSEL 6.3 02/37] power: supply: sc27xx: " Sasha Levin
  0 siblings, 1 reply; 39+ messages in thread
From: Sasha Levin @ 2023-06-15 11:36 UTC (permalink / raw)
  To: linux-kernel, stable
  Cc: Hans de Goede, Linus Walleij, Sebastian Reichel, Sasha Levin, sre,
	linux-pm

From: Hans de Goede <hdegoede@redhat.com>

[ Upstream commit a5299ce4e96f3e8930e9c051b28d8093ada87b08 ]

ab8500_btemp_external_power_changed() dereferences di->btemp_psy,
which gets sets in ab8500_btemp_probe() like this:

        di->btemp_psy = devm_power_supply_register(dev, &ab8500_btemp_desc,
                                                   &psy_cfg);

As soon as devm_power_supply_register() has called device_add()
the external_power_changed callback can get called. So there is a window
where ab8500_btemp_external_power_changed() may get called while
di->btemp_psy has not been set yet leading to a NULL pointer dereference.

Fixing this is easy. The external_power_changed callback gets passed
the power_supply which will eventually get stored in di->btemp_psy,
so ab8500_btemp_external_power_changed() can simply directly use
the passed in psy argument which is always valid.

And the same applies to ab8500_fg_external_power_changed().

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/power/supply/ab8500_btemp.c | 6 ++----
 drivers/power/supply/ab8500_fg.c    | 6 ++----
 2 files changed, 4 insertions(+), 8 deletions(-)

diff --git a/drivers/power/supply/ab8500_btemp.c b/drivers/power/supply/ab8500_btemp.c
index 307ee6f71042e..6f83e99d2eb72 100644
--- a/drivers/power/supply/ab8500_btemp.c
+++ b/drivers/power/supply/ab8500_btemp.c
@@ -624,10 +624,8 @@ static int ab8500_btemp_get_ext_psy_data(struct device *dev, void *data)
  */
 static void ab8500_btemp_external_power_changed(struct power_supply *psy)
 {
-	struct ab8500_btemp *di = power_supply_get_drvdata(psy);
-
-	class_for_each_device(power_supply_class, NULL,
-		di->btemp_psy, ab8500_btemp_get_ext_psy_data);
+	class_for_each_device(power_supply_class, NULL, psy,
+			      ab8500_btemp_get_ext_psy_data);
 }
 
 /* ab8500 btemp driver interrupts and their respective isr */
diff --git a/drivers/power/supply/ab8500_fg.c b/drivers/power/supply/ab8500_fg.c
index 41a7bff9ac376..53560fbb6dcd3 100644
--- a/drivers/power/supply/ab8500_fg.c
+++ b/drivers/power/supply/ab8500_fg.c
@@ -2407,10 +2407,8 @@ static int ab8500_fg_init_hw_registers(struct ab8500_fg *di)
  */
 static void ab8500_fg_external_power_changed(struct power_supply *psy)
 {
-	struct ab8500_fg *di = power_supply_get_drvdata(psy);
-
-	class_for_each_device(power_supply_class, NULL,
-		di->fg_psy, ab8500_fg_get_ext_psy_data);
+	class_for_each_device(power_supply_class, NULL, psy,
+			      ab8500_fg_get_ext_psy_data);
 }
 
 /**
-- 
2.39.2


^ permalink raw reply related	[flat|nested] 39+ messages in thread

end of thread, other threads:[~2023-06-15 11:37 UTC | newest]

Thread overview: 39+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2023-05-31 13:39 [PATCH AUTOSEL 6.3 01/37] power: supply: ab8500: Fix external_power_changed race Sasha Levin
2023-05-31 13:39 ` [PATCH AUTOSEL 6.3 02/37] power: supply: sc27xx: " Sasha Levin
2023-05-31 13:39 ` [PATCH AUTOSEL 6.3 03/37] power: supply: bq27xxx: Use mod_delayed_work() instead of cancel() + schedule() Sasha Levin
2023-05-31 13:39 ` [PATCH AUTOSEL 6.3 04/37] ARM: dts: vexpress: add missing cache properties Sasha Levin
2023-05-31 13:39 ` [PATCH AUTOSEL 6.3 05/37] arm64: dts: arm: " Sasha Levin
2023-05-31 13:39 ` [PATCH AUTOSEL 6.3 06/37] tools: gpio: fix debounce_period_us output of lsgpio Sasha Levin
2023-05-31 13:39 ` [PATCH AUTOSEL 6.3 07/37] selftests: gpio: gpio-sim: Fix BUG: test FAILED due to recent change Sasha Levin
2023-05-31 13:39 ` [PATCH AUTOSEL 6.3 08/37] power: supply: Ratelimit no data debug output Sasha Levin
2023-05-31 13:39 ` [PATCH AUTOSEL 6.3 09/37] PCI/DPC: Quirk PIO log size for Intel Ice Lake Root Ports Sasha Levin
2023-05-31 13:39 ` [PATCH AUTOSEL 6.3 10/37] platform/x86: asus-wmi: Ignore WMI events with codes 0x7B, 0xC0 Sasha Levin
2023-05-31 13:39 ` [PATCH AUTOSEL 6.3 11/37] regulator: Fix error checking for debugfs_create_dir Sasha Levin
2023-05-31 13:39 ` [PATCH AUTOSEL 6.3 12/37] irqchip/gic-v3: Disable pseudo NMIs on Mediatek devices w/ firmware issues Sasha Levin
2023-05-31 13:58   ` Doug Anderson
2023-05-31 13:39 ` [PATCH AUTOSEL 6.3 13/37] irqchip/meson-gpio: Mark OF related data as maybe unused Sasha Levin
2023-05-31 13:39 ` [PATCH AUTOSEL 6.3 14/37] power: supply: Fix logic checking if system is running from battery Sasha Levin
2023-05-31 13:39 ` [PATCH AUTOSEL 6.3 15/37] ASoC: lpass: Fix for KASAN use_after_free out of bounds Sasha Levin
2023-05-31 13:39 ` [PATCH AUTOSEL 6.3 16/37] drm: panel-orientation-quirks: Change Air's quirk to support Air Plus Sasha Levin
2023-05-31 13:39 ` [PATCH AUTOSEL 6.3 17/37] btrfs: scrub: try harder to mark RAID56 block groups read-only Sasha Levin
2023-05-31 13:40 ` [PATCH AUTOSEL 6.3 18/37] btrfs: handle memory allocation failure in btrfs_csum_one_bio Sasha Levin
2023-05-31 13:40 ` [PATCH AUTOSEL 6.3 19/37] ASoC: soc-pcm: test if a BE can be prepared Sasha Levin
2023-05-31 13:40 ` [PATCH AUTOSEL 6.3 20/37] tls: rx: strp: force mixed decrypted records into copy mode Sasha Levin
2023-05-31 13:40 ` [PATCH AUTOSEL 6.3 21/37] sfc: fix devlink info error handling Sasha Levin
2023-05-31 13:40 ` [PATCH AUTOSEL 6.3 22/37] ASoC: Intel: avs: Account for UID of ACPI device Sasha Levin
2023-05-31 13:40 ` [PATCH AUTOSEL 6.3 23/37] ASoC: Intel: avs: Fix avs_path_module::instance_id size Sasha Levin
2023-05-31 13:40 ` [PATCH AUTOSEL 6.3 24/37] ASoC: Intel: avs: Add missing checks on FE startup Sasha Levin
2023-05-31 13:40 ` [PATCH AUTOSEL 6.3 25/37] parisc: Improve cache flushing for PCXL in arch_sync_dma_for_cpu() Sasha Levin
2023-05-31 13:40 ` [PATCH AUTOSEL 6.3 26/37] parisc: Flush gatt writes and adjust gatt mask in parisc_agp_mask_memory() Sasha Levin
2023-05-31 13:40 ` [PATCH AUTOSEL 6.3 27/37] erofs: use HIPRI by default if per-cpu kthreads are enabled Sasha Levin
2023-05-31 13:40 ` [PATCH AUTOSEL 6.3 28/37] MIPS: unhide PATA_PLATFORM Sasha Levin
2023-05-31 13:40 ` [PATCH AUTOSEL 6.3 29/37] MIPS: Restore Au1300 support Sasha Levin
2023-05-31 13:40 ` [PATCH AUTOSEL 6.3 30/37] MIPS: Alchemy: fix dbdma2 Sasha Levin
2023-05-31 13:40 ` [PATCH AUTOSEL 6.3 31/37] mips: Move initrd_start check after initrd address sanitisation Sasha Levin
2023-05-31 13:40 ` [PATCH AUTOSEL 6.3 32/37] ASoC: cs35l41: Fix default regmap values for some registers Sasha Levin
2023-05-31 13:40 ` [PATCH AUTOSEL 6.3 33/37] ASoC: dwc: move DMA init to snd_soc_dai_driver probe() Sasha Levin
2023-05-31 13:40 ` [PATCH AUTOSEL 6.3 34/37] xen/blkfront: Only check REQ_FUA for writes Sasha Levin
2023-05-31 13:40 ` [PATCH AUTOSEL 6.3 35/37] drm:amd:amdgpu: Fix missing buffer object unlock in failure path Sasha Levin
2023-05-31 13:40 ` [PATCH AUTOSEL 6.3 36/37] io_uring: unlock sqd->lock before sq thread release CPU Sasha Levin
2023-05-31 13:40 ` [PATCH AUTOSEL 6.3 37/37] NVMe: Add MAXIO 1602 to bogus nid list Sasha Levin
  -- strict thread matches above, loose matches on Subject: below --
2023-06-15 11:36 [PATCH AUTOSEL 6.3 01/37] power: supply: ab8500: Fix external_power_changed race Sasha Levin
2023-06-15 11:36 ` [PATCH AUTOSEL 6.3 02/37] power: supply: sc27xx: " Sasha Levin

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