From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EA037375256 for ; Sat, 28 Feb 2026 18:16:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772302587; cv=none; b=FKLbTdV2VTqe3yjwT9TRuOA9ZsveevdAHpGPm8SnIMCFaZvbFZrY34ZEew35dFu7RxDAZ1u7Z9fQHfv3kdECwaLPfjPu31YfdjRNyKKiWENJRKlBl6EnMBtkpv1Or53GJ47o3OXdZRLzWThFyeu+rO/q9jCF8xijskn2fG/TyOQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772302587; c=relaxed/simple; bh=eeWexgnzNPc30/Jfq1iEOyClMRDFUuEODfSFwWkXx0M=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=H/rwhN+oBsU7PXNfbs7ymnYMFvtJEJlfheA8G9xMP1TXl1pgU92J044wZrO6ssyOckfftC+PcF3zuHaouMo/Z8tqr8+wdiN2CU1VaU8X3qZ9gmY2WSCg57uqccvQInqdH4M189cBn1hClg3I5hoV/lPHYTIR6NVhn4hhLLuQHJI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=MF+j7Cnz; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="MF+j7Cnz" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 36597C116D0; Sat, 28 Feb 2026 18:16:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772302586; bh=eeWexgnzNPc30/Jfq1iEOyClMRDFUuEODfSFwWkXx0M=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=MF+j7Cnzyg9QaZA9Jr9sObC5flbSZ1qXJQ9ADrOBDGtg07s5jG7Y445CmnUpTj5Gv LUOkXry0920YsK82ZxnVodLdl2cPjMYlhySE15m4HvojgQfjBNZi8x/3lEXnv64aNh LvhklhkuI3l6QcSa7hnTcd3KH6OjIhi1irnIgtcJHEn7JURU0Pi6CixlgMHrJtiJvv JDT1c8kkNW5ogt9fM3FVJAqmCMtkXnchhq6hL7A8Wztoxmx5KTvC9w/afzzaE67W2e bSJ0KZopVSfXCTdmKNs5d9gKFRLnMdFEoaypCgnwAFb983c5Yjm1eqU0ZENu72GnSC ri9AS8EQek98Q== From: Sasha Levin To: patches@lists.linux.dev Cc: Waqar Hameed , Linus Walleij , Sebastian Reichel , Sasha Levin Subject: [PATCH 5.15 096/164] power: supply: ab8500: Fix use-after-free in power_supply_changed() Date: Sat, 28 Feb 2026 13:13:55 -0500 Message-ID: <20260228181505.1600663-96-sashal@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260228181505.1600663-1-sashal@kernel.org> References: <20260228181505.1600663-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit From: Waqar Hameed [ Upstream commit c4af8a98bb52825a5331ae1d0604c0ea6956ba4b ] Using the `devm_` variant for requesting IRQ _before_ the `devm_` variant for allocating/registering the `power_supply` handle, means that the `power_supply` 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 `power_supply` handle has been freed, *but* just _before_ the corresponding unregistration of the IRQ handler has run. This will lead to the IRQ handler calling `power_supply_changed()` with a freed `power_supply` handle. Which usually crashes the system or otherwise silently corrupts the memory... Note that there is a similar situation which can also happen during `probe()`; the possibility of an interrupt firing _before_ registering the `power_supply` handle. This would then lead to the nasty situation of using the `power_supply` handle *uninitialized* in `power_supply_changed()`. Commit 1c1f13a006ed ("power: supply: ab8500: Move to componentized binding") introduced this issue during a refactorization. Fix this racy use-after-free by making sure the IRQ is requested _after_ the registration of the `power_supply` handle. Fixes: 1c1f13a006ed ("power: supply: ab8500: Move to componentized binding") Signed-off-by: Waqar Hameed Reviewed-by: Linus Walleij Link: https://patch.msgid.link/ccf83a09942cb8dda3dff70b2682f2c2e9cb97f2.1766268280.git.waqar.hameed@axis.com Signed-off-by: Sebastian Reichel Signed-off-by: Sasha Levin --- drivers/power/supply/ab8500_charger.c | 40 +++++++++++++-------------- 1 file changed, 20 insertions(+), 20 deletions(-) diff --git a/drivers/power/supply/ab8500_charger.c b/drivers/power/supply/ab8500_charger.c index 6af946ca06a94..cce2f3c13b797 100644 --- a/drivers/power/supply/ab8500_charger.c +++ b/drivers/power/supply/ab8500_charger.c @@ -3457,26 +3457,6 @@ static int ab8500_charger_probe(struct platform_device *pdev) return ret; } - /* Request interrupts */ - for (i = 0; i < ARRAY_SIZE(ab8500_charger_irq); i++) { - irq = platform_get_irq_byname(pdev, ab8500_charger_irq[i].name); - if (irq < 0) - return irq; - - ret = devm_request_threaded_irq(dev, - irq, NULL, ab8500_charger_irq[i].isr, - IRQF_SHARED | IRQF_NO_SUSPEND | IRQF_ONESHOT, - ab8500_charger_irq[i].name, di); - - if (ret != 0) { - dev_err(dev, "failed to request %s IRQ %d: %d\n" - , ab8500_charger_irq[i].name, irq, ret); - return ret; - } - dev_dbg(dev, "Requested %s IRQ %d: %d\n", - ab8500_charger_irq[i].name, irq, ret); - } - /* initialize lock */ spin_lock_init(&di->usb_state.usb_lock); mutex_init(&di->usb_ipt_crnt_lock); @@ -3607,6 +3587,26 @@ static int ab8500_charger_probe(struct platform_device *pdev) return PTR_ERR(di->usb_chg.psy); } + /* Request interrupts */ + for (i = 0; i < ARRAY_SIZE(ab8500_charger_irq); i++) { + irq = platform_get_irq_byname(pdev, ab8500_charger_irq[i].name); + if (irq < 0) + return irq; + + ret = devm_request_threaded_irq(dev, + irq, NULL, ab8500_charger_irq[i].isr, + IRQF_SHARED | IRQF_NO_SUSPEND | IRQF_ONESHOT, + ab8500_charger_irq[i].name, di); + + if (ret != 0) { + dev_err(dev, "failed to request %s IRQ %d: %d\n" + , ab8500_charger_irq[i].name, irq, ret); + return ret; + } + dev_dbg(dev, "Requested %s IRQ %d: %d\n", + ab8500_charger_irq[i].name, irq, ret); + } + /* * Check what battery we have, since we always have the USB * psy, use that as a handle. -- 2.51.0