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Sun, 30 Mar 2025 11:43:43 -0700 (PDT) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 Date: Sun, 30 Mar 2025 15:43:40 -0300 Message-Id: Cc: , , , , "Damian Tometzki" Subject: Re: [PATCH] platform/x86: thinkpad_acpi: Fix NULL pointer dereferences while probing From: "Kurt Borja" To: "Kurt Borja" , "Henrique de Moraes Holschuh" , "Hans de Goede" , =?utf-8?q?Ilpo_J=C3=A4rvinen?= , "Mark Pearson" X-Mailer: aerc 0.20.1-0-g2ecb8770224a References: <20250330-thinkpad-fix-v1-1-4906b3fe6b74@gmail.com> In-Reply-To: <20250330-thinkpad-fix-v1-1-4906b3fe6b74@gmail.com> On Sun Mar 30, 2025 at 12:39 PM -03, Kurt Borja wrote: > Some subdrivers make use of the global reference tpacpi_pdev during > initialization, which is called from the platform driver's probe. > However, after > > commit 38b9ab80db31 ("platform/x86: thinkpad_acpi: Move subdriver initial= ization to tpacpi_pdriver's probe.") > > this variable is only properly initialized *after* probing and this can > result in a NULL pointer dereference. > > In order to fix this without reverting the commit, register the platform > bundle in two steps, first create and initialize tpacpi_pdev, then > register the driver synchronously with platform_driver_probe(). This way > the benefits of commit 38b9ab80db31 are preserved. > > Additionally, > > commit 43fc63a1e8f6 ("platform/x86: thinkpad_acpi: Move HWMON initializat= ion to tpacpi_hwmon_pdriver's probe") > > introduced a similar problem, however tpacpi_sensors_pdev is only used > once inside the probe, so replace the global reference with the one > given by the probe. I don't understand why b4 added the linux-riscv list to the recipients, but it was definitely not inteded. Sorry for the noise. --=20 ~ Kurt