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power: supply: pm8916_lbc: Fix use-after-free for extcon in IRQ handler

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Using the `devm_` variant for requesting IRQ _before_ the `devm_`
variant for allocating/registering the `extcon` handle, means that the
`extcon` handle will be deallocated/unregistered _before_ the interrupt
handler (since `devm_` naturally deallocates in reverse allocation
order). This means that during removal, there is a race condition where
an interrupt can fire just _after_ the `extcon` handle has been
freed, *but* just _before_ the corresponding unregistration of the IRQ
handler has run.

This will lead to the IRQ handler calling `extcon_set_state_sync()` with
a freed `extcon` handle. Which usually crashes the system or otherwise
silently corrupts the memory...

Fix this racy use-after-free by making sure the IRQ is requested _after_
the registration of the `extcon` handle.

Fixes: f8d7a3d211 ("power: supply: Add driver for pm8916 lbc")
Signed-off-by: Waqar Hameed <waqar.hameed@axis.com>
Reviewed-by: Nikita Travkin <nikita@trvn.ru>
Link: https://patch.msgid.link/e2a4cd2fcd42b6cd97d856c17c097289a2aed393.1769163273.git.waqar.hameed@axis.com
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
This commit is contained in:
Waqar Hameed
2026-01-30 20:55:19 +01:00
committed by Sebastian Reichel
parent 562357a631
commit 2306725991
1 changed files with 5 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/power/supply/pm8916_lbc.c
+5 -5
View File
@@ -327,11 +327,6 @@ static int pm8916_lbc_charger_probe(struct platform_device *pdev)
if (irq < 0)
return irq;
ret = devm_request_threaded_irq(dev, irq, NULL, pm8916_lbc_charger_state_changed_irq,
IRQF_ONESHOT, "pm8916_lbc", chg);
if (ret)
return ret;
chg->edev = devm_extcon_dev_allocate(dev, pm8916_lbc_charger_cable);
if (IS_ERR(chg->edev))
return PTR_ERR(chg->edev);
@@ -340,6 +335,11 @@ static int pm8916_lbc_charger_probe(struct platform_device *pdev)
if (ret < 0)
return dev_err_probe(dev, ret, "failed to register extcon device\n");
ret = devm_request_threaded_irq(dev, irq, NULL, pm8916_lbc_charger_state_changed_irq,
IRQF_ONESHOT, "pm8916_lbc", chg);
if (ret)
return ret;
ret = regmap_read(chg->regmap, chg->reg[LBC_USB] + PM8916_INT_RT_STS, &tmp);
if (ret)
goto comm_error;