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Mon, 11 May 2026 03:42:24 -0700 (PDT) Received: from localhost.localdomain ([82.215.118.79]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-4548ec6b00fsm26824651f8f.11.2026.05.11.03.42.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 11 May 2026 03:42:24 -0700 (PDT) From: Stepan Ionichev To: alexandre.belloni@bootlin.com Cc: daniel@thingy.jp, romain.perier@gmail.com, linux-arm-kernel@lists.infradead.org, linux-rtc@vger.kernel.org, linux-kernel@vger.kernel.org, sozdayvek@gmail.com Subject: [PATCH] rtc: msc313: fix NULL deref in shared IRQ handler at probe Date: Mon, 11 May 2026 08:27:03 +0500 Message-Id: <20260511032703.48262-1-sozdayvek@gmail.com> X-Mailer: git-send-email 2.33.0.windows.2 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit msc313_rtc_probe() calls devm_request_irq() with IRQF_SHARED and &pdev->dev as the cookie, but platform_set_drvdata() is only called later after the clock setup. With a shared IRQ line, another device on the same line can trigger the handler in that window. The handler does dev_get_drvdata() on the cookie, gets NULL, and dereferences priv->rtc_base in interrupt context. Pass priv as the cookie directly so the handler reads it from dev_id without the lookup, removing the dependency on probe order. Fixes: be7d9c9161b9 ("rtc: Add support for the MSTAR MSC313 RTC") Signed-off-by: Stepan Ionichev --- drivers/rtc/rtc-msc313.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/rtc/rtc-msc313.c b/drivers/rtc/rtc-msc313.c index 8d7737e0e..6ef9c4efd 100644 --- a/drivers/rtc/rtc-msc313.c +++ b/drivers/rtc/rtc-msc313.c @@ -160,7 +160,7 @@ static const struct rtc_class_ops msc313_rtc_ops = { static irqreturn_t msc313_rtc_interrupt(s32 irq, void *dev_id) { - struct msc313_rtc *priv = dev_get_drvdata(dev_id); + struct msc313_rtc *priv = dev_id; u16 reg; reg = readw(priv->rtc_base + REG_RTC_STATUS_INT); @@ -206,7 +206,7 @@ static int msc313_rtc_probe(struct platform_device *pdev) priv->rtc_dev->range_max = U32_MAX; ret = devm_request_irq(dev, irq, msc313_rtc_interrupt, IRQF_SHARED, - dev_name(&pdev->dev), &pdev->dev); + dev_name(&pdev->dev), priv); if (ret) { dev_err(dev, "Could not request IRQ\n"); return ret; -- 2.43.0