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 2B05D15E8B; Mon, 30 Dec 2024 15:55:51 +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=1735574151; cv=none; b=hA+hsYRCrlUw7FiFwMAZ4dRfftzRYCobQ0cFgOP7ZRWUPrSZoeNZ59u5A8sR5rYmaTbLMWRSzRrbXOuMsPI0swQlKi6xC7PE47aL85xScADHVjLlEIlwfmY2aayMMnlRObwAHFO0v/MPVxuBsjQl0K7IuTVhx0GV1236+OfOw4g= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1735574151; c=relaxed/simple; bh=Xm1azQ3bZ9ez+Jcyztvorod2ukURyO+Mkikbj9Mo/Ow=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=eUlKM0GIQW+5ozBBxJYP+7G8/5jlTbtl7VH2cWmYl70lT8RwSXhfnRzgRtWaKXUq+FNxJNQ+yH0UMMCwRC+j9XUUeuL3PBztaqadYLxzTV3y5U0JxYzaKk0mrlnm9lKlYdLsdkRd37E3DnhJzMSI4Yqw/mv6mDJEDnstp2lLzhw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=v6fDNRAv; 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="v6fDNRAv" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9000CC4CED0; Mon, 30 Dec 2024 15:55:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1735574151; bh=Xm1azQ3bZ9ez+Jcyztvorod2ukURyO+Mkikbj9Mo/Ow=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=v6fDNRAvDPnpVmzs7iaW85oGXgZqaN+26z4nFoBHsrSg67JJ/bNR4VsG23/kkdQJm UbEh7yRWE8HbpKvaCQE4kNidxcKbF75Zq0rSJ2f3meJvTqDFZzBk6C388dPN9GvHjO iQRRsrA70fjflQ15Kz9tFDbi1kKqlU0XcEQLdZfo= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Lorenzo Pieralisi , =?UTF-8?q?Krzysztof=20Wilczy=C5=84ski?= , Bjorn Helgaas , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Johan Hovold , Zijun Hu , Vinod Koul Subject: [PATCH 6.12 021/114] phy: core: Fix that API devm_phy_put() fails to release the phy Date: Mon, 30 Dec 2024 16:42:18 +0100 Message-ID: <20241230154218.879980692@linuxfoundation.org> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20241230154218.044787220@linuxfoundation.org> References: <20241230154218.044787220@linuxfoundation.org> User-Agent: quilt/0.68 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-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Zijun Hu commit fe4bfa9b6d7bd752bfe4700c937f235aa8ce997b upstream. For devm_phy_put(), its comment says it needs to invoke phy_put() to release the phy, but it will not actually invoke the function since devres_destroy() does not call devm_phy_release(), and the missing phy_put() call will cause: - The phy fails to be released. - devm_phy_put() can not fully undo what API devm_phy_get() does. - Leak refcount of both the module and device for below typical usage: devm_phy_get(); // or its variant ... err = do_something(); if (err) goto err_out; ... err_out: devm_phy_put(); // leak refcount here The file(s) affected by this issue are shown below since they have such typical usage. drivers/pci/controller/cadence/pcie-cadence.c drivers/net/ethernet/ti/am65-cpsw-nuss.c Fix by using devres_release() instead of devres_destroy() within the API. Fixes: ff764963479a ("drivers: phy: add generic PHY framework") Cc: stable@vger.kernel.org Cc: Lorenzo Pieralisi Cc: Krzysztof Wilczyński Cc: Bjorn Helgaas Cc: David S. Miller Cc: Eric Dumazet Cc: Jakub Kicinski Cc: Paolo Abeni Reviewed-by: Johan Hovold Signed-off-by: Zijun Hu Link: https://lore.kernel.org/r/20241213-phy_core_fix-v6-1-40ae28f5015a@quicinc.com Signed-off-by: Vinod Koul Signed-off-by: Greg Kroah-Hartman --- drivers/phy/phy-core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/phy/phy-core.c +++ b/drivers/phy/phy-core.c @@ -742,7 +742,7 @@ void devm_phy_put(struct device *dev, st if (!phy) return; - r = devres_destroy(dev, devm_phy_release, devm_phy_match, phy); + r = devres_release(dev, devm_phy_release, devm_phy_match, phy); dev_WARN_ONCE(dev, r, "couldn't find PHY resource\n"); } EXPORT_SYMBOL_GPL(devm_phy_put);