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 CF02123ED5B; Fri, 9 Jan 2026 12:12:03 +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=1767960723; cv=none; b=Ves42dTxFGRfPM6noBTzmqmzXbRwPlnvaZgOnxnXAMji6J/V0p660013HVF6so2vNIo4unzZ/rLkWSkZWzNYHEBQnl0W0gIrUIBfeoRQq71Wa6DdIsu3WV8z/0JTzV48JqA4qXVrI57b2+hJPBbNCxMqcpi79a+QrpKDbbz73j8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767960723; c=relaxed/simple; bh=3hRexHjOCjLhnnOFEZ3PiaJx/OnhO86SBtKRH8Pyy9I=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=DM49x0DDi7nTvGxo3W4kC2TzwKzzdqXaap+5hZHnonsyWNLwBQnjqJsj6+LcX2TsYtnradDsPzN/6Ru0MbuR2c2rqoyQpWlef7hKQ/lQ39iW/HIpopmPv/EKgRmTRJg8mOpeivfcctSvrsqb8GHuTGM6L92NS6I3CEiss90CkAg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Fblr/JDA; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="Fblr/JDA" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 27252C4CEF1; Fri, 9 Jan 2026 12:12:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1767960723; bh=3hRexHjOCjLhnnOFEZ3PiaJx/OnhO86SBtKRH8Pyy9I=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Fblr/JDAPCY8DHbpa7Dk01tySqNNOgZWE7lz+qiaqckNjlHe8G+NaY+BakSY7V3CM qzSyZ1pikmJoZhsH6i6SzFIbg0bnSmdOhdb4x/bONynp4zfWhDyKlJI21GZlWFQYKO C18lwERRT7c5HVaLa1PPW99J6Y0xrdZAUUZ7UksI= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Ma Ke , Andi Shyti Subject: [PATCH 6.6 495/737] i2c: amd-mp2: fix reference leak in MP2 PCI device Date: Fri, 9 Jan 2026 12:40:34 +0100 Message-ID: <20260109112152.612248820@linuxfoundation.org> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260109112133.973195406@linuxfoundation.org> References: <20260109112133.973195406@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Ma Ke commit a6ee6aac66fb394b7f6e6187c73bdcd873f2d139 upstream. In i2c_amd_probe(), amd_mp2_find_device() utilizes driver_find_next_device() which internally calls driver_find_device() to locate the matching device. driver_find_device() increments the reference count of the found device by calling get_device(), but amd_mp2_find_device() fails to call put_device() to decrement the reference count before returning. This results in a reference count leak of the PCI device each time i2c_amd_probe() is executed, which may prevent the device from being properly released and cause a memory leak. Found by code review. Cc: stable@vger.kernel.org Fixes: 529766e0a011 ("i2c: Add drivers for the AMD PCIe MP2 I2C controller") Signed-off-by: Ma Ke Signed-off-by: Andi Shyti Link: https://lore.kernel.org/r/20251022095402.8846-1-make24@iscas.ac.cn Signed-off-by: Greg Kroah-Hartman --- drivers/i2c/busses/i2c-amd-mp2-pci.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) --- a/drivers/i2c/busses/i2c-amd-mp2-pci.c +++ b/drivers/i2c/busses/i2c-amd-mp2-pci.c @@ -461,13 +461,16 @@ struct amd_mp2_dev *amd_mp2_find_device( { struct device *dev; struct pci_dev *pci_dev; + struct amd_mp2_dev *mp2_dev; dev = driver_find_next_device(&amd_mp2_pci_driver.driver, NULL); if (!dev) return NULL; pci_dev = to_pci_dev(dev); - return (struct amd_mp2_dev *)pci_get_drvdata(pci_dev); + mp2_dev = (struct amd_mp2_dev *)pci_get_drvdata(pci_dev); + put_device(dev); + return mp2_dev; } EXPORT_SYMBOL_GPL(amd_mp2_find_device);