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 94C595695; Tue, 6 Jan 2026 17:31:45 +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=1767720706; cv=none; b=PRwTiky4QE+B24r1Fg/ABZk5906+LVoYB+IE8BtmwBvs3+z8TwCJ5PmCjXTmZrbFfvCm0C4yGyKDnBkJbLlnVLF0KaFTVJlhFHpUAWa+7UoR1gDr+Skuc2lNRShw7IpF1gp4W1IS57DAwO7+cTFSR33ThKVJY+8qfOsijhkccV4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767720706; c=relaxed/simple; bh=/Xt9PdgjELG6ROqyWbEq3eqTnq7akhuQ/7mtJkEABos=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=kaugttocoYGY8YEUD8AIgmzC2UnqLrapvI1tmD7i+CnZ9pO4JacvqLMYPhY4djr0UTlazYlpts1h1lygtKD50Bec3Rn5cin3W+6lfAQaTzpfEzqpq8xbYT0yqCBCWe1lenfFIfwArg+BlSLDQguWeQfqaPpIsybZm6dH/qt+j5o= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=rU6oBDZP; 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="rU6oBDZP" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 62987C116C6; Tue, 6 Jan 2026 17:31:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1767720705; bh=/Xt9PdgjELG6ROqyWbEq3eqTnq7akhuQ/7mtJkEABos=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=rU6oBDZPgLxhXEDLX9EemGGkkhdkz8hpV6uVitFaX4VpuVkWLYs/50QTwY23qRKqH /tN4vY4rwI2bLFzPn6llrF4hQmh+wkYtZbpvc5YBZrLaXdmlyKisz50dyJxXcEWn+q lGkOpxnPdAxFo4Q/ZYdivKlaz5Y4RWT/aEpUIKVU= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Ma Ke , Andi Shyti Subject: [PATCH 6.12 284/567] i2c: amd-mp2: fix reference leak in MP2 PCI device Date: Tue, 6 Jan 2026 18:01:06 +0100 Message-ID: <20260106170501.837929200@linuxfoundation.org> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260106170451.332875001@linuxfoundation.org> References: <20260106170451.332875001@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 6.12-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);