From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793829441; b=cDAZaPigy+S3CkZBv4F6is0dmVCdB3UAb0vQvRAxLpqBFX/SvPGoGNh7kW2bUvBs3tmz md7JXBugve1GDCm7GHDFWups2XcmaF2d0svQRfWdqGFpFzEHGKEE3/iLhSWLWJBwKw82F w7m3UNOodDrQZ90Iwj9qfPDTGguoLN4seHDsD8hQCWoWcXQHhynXbGKvKtYGbj/n5a8Ag sKVCFiJEGVgaCpY7ag3moG7FCGDkwz8ZgmlwVevF9nrlZQk/XuZs2qclKXZWuhRo0HvUl dBj9yXDTQtd08IQ4INPFq0MJTM9w+rji1yrPugOC7Xn2+9JVqhH9sPDgu0UYCpzCFnQ== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793829441; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:User-Agent:X-stable:X-Patchwork-Hint: MIME-Version:Content-Transfer-Encoding; bh=ZFe2myoJdf3pxJn/2s8nOCE9jtOKpm1zsMTKqDTj2XU=; b=Q71iszShUWsLfj8qAkXCYy7uiXFwmAoWrlhx4wg074HJ7f6iAYGQH7Hh5EfbGzYYMW14 y3jYmRaQmJHcxQOV+xC6oaMeU/WWR8Auqh23qNcgqq8SWxvTFccAgdVsuuk37YqHl8nQm 8TlRgkuGARpL+i9YfDew7ZDmaceFhEgN6vZPj0Pil685mLJFe1ZRrZDueFw05+gl/1qrr aNAgUKeJWv1NUzgTeIl+5VldWTJqPQA628qXwPOkObBYSola8ePLFGmnxpj3aglx3xIjx 4WnzLdaopMDpV/uMDjgV6XpiHVpL1mJF9BVwAFPP8c6mF2boucbgmwpcSlhBjHVPGPQ== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=ZiJy+Bkh; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C5763606A863; Wed, 4 Nov 2026 21:57:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key, unprotected) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=ZiJy+Bkh Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5E63F1F0093A; Wed, 4 Nov 2026 21:57:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1793829440; bh=ZFe2myoJdf3pxJn/2s8nOCE9jtOKpm1zsMTKqDTj2XU=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=ZiJy+BkhVMChVhnGbaj3nfxVqtqgQdQt4ln0pKVz9k0IpcGKSdz9f8tb+B4RevLFo 24AFFx2qmOH1ZTun5iJTYT3kLd/GMQ65QBYvTTExxbzDE/baX7NMXqgDQF8Je8BP27 0FeUvkYnrf0CsYbLMhC8TX22L+pnDLdP/hPEdxoA= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Haoxiang Li , Andy Shevchenko , Sasha Levin Subject: [PATCH 6.18 0127/1005] tty: serial: pch_uart: add check for pci_get_slot() Date: Wed, 4 Nov 2026 15:57:40 -0500 Message-ID: <20261104211047.236854778@linuxfoundation.org> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261104211043.516122098@linuxfoundation.org> References: <20261104211043.516122098@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore X-Mailing-List: patches@lists.linux.dev List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Haoxiang Li [ Upstream commit 970ede67de0e3f6a1e707ec99ae49d80bf3f2966 ] Add check for pci_get_slot() to prevent a potetial null pointer dereference in pch_request_dma(). Signed-off-by: Haoxiang Li Reviewed-by: Andy Shevchenko Link: https://patch.msgid.link/20260623140539.2272473-1-haoxiang_li2024@163.com Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/tty/serial/pch_uart.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/tty/serial/pch_uart.c b/drivers/tty/serial/pch_uart.c index c3f32e0590b7f..9104361ccb14f 100644 --- a/drivers/tty/serial/pch_uart.c +++ b/drivers/tty/serial/pch_uart.c @@ -678,6 +678,11 @@ static void pch_request_dma(struct uart_port *port) /* Get DMA's dev information */ dma_dev = pci_get_slot(priv->pdev->bus, PCI_DEVFN(PCI_SLOT(priv->pdev->devfn), 0)); + if (!dma_dev) { + dev_err(priv->port.dev, "%s: failed to get DMA device\n", + __func__); + return; + } /* Set Tx DMA */ param = &priv->param_tx; -- 2.53.0