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Fri, 12 Jun 2026 11:32:45 -0700 (PDT) From: Rosen Penev To: linux-ide@vger.kernel.org Cc: Damien Le Moal , Niklas Cassel , Grant Likely , Tim Yamin , Julia Lawall , Jeff Garzik , linux-kernel@vger.kernel.org (open list) Subject: [PATCHv3 1/6] ata: pata_mpc52xx: fix NULL pointer dereference in IRQ handler Date: Fri, 12 Jun 2026 11:32:22 -0700 Message-ID: <20260612183227.20446-2-rosenp@gmail.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260612183227.20446-1-rosenp@gmail.com> References: <20260612183227.20446-1-rosenp@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Assign priv->dmatsk before request_irq() to ensure the IRQ handler does not dereference a NULL pointer. The handler accesses priv->dmatsk via bcom_retrieve_buffer(). Assisted-by: opencode:big-pickle Fixes: 6b61e69e7bc1 ("powerpc/mpc5200: Add MDMA/UDMA support to MPC5200 ATA driver") Signed-off-by: Rosen Penev --- drivers/ata/pata_mpc52xx.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/ata/pata_mpc52xx.c b/drivers/ata/pata_mpc52xx.c index 210a63283f62..fe445d6aaff6 100644 --- a/drivers/ata/pata_mpc52xx.c +++ b/drivers/ata/pata_mpc52xx.c @@ -766,6 +766,8 @@ static int mpc52xx_ata_probe(struct platform_device *op) goto err1; } + priv->dmatsk = dmatsk; + task_irq = bcom_get_task_irq(dmatsk); rv = devm_request_irq(&op->dev, task_irq, &mpc52xx_ata_task_irq, 0, "ATA task", priv); @@ -773,7 +775,6 @@ static int mpc52xx_ata_probe(struct platform_device *op) dev_err(&op->dev, "error requesting DMA IRQ\n"); goto err2; } - priv->dmatsk = dmatsk; /* Init the hw */ rv = mpc52xx_ata_hw_init(priv); -- 2.54.0