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 7A9BB200A5 for ; Mon, 6 Nov 2023 13:07:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="Vc0sAOk+" Received: by smtp.kernel.org (Postfix) with ESMTPSA id EBF85C433C7; Mon, 6 Nov 2023 13:07:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1699276049; bh=lC5QrUYsZQtV32yCV88QMCHKVjw7BSZHs8UKDSZnro4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Vc0sAOk+xFW5fAhjC6KlMUKy2BWgMdjB/5wRiur79mpykjK+EGupBjm9BFczcOBvn Qp5fEfy52ij2rIEl++PmJSZ+ziwVpWuQ1lO3j+4YRuUrBWyRTbOyNK+2LWgsFxRioO /i2gLxcIlDisqSdc5JNTCl7fdIYCW73kjvG4LQTo= From: Greg Kroah-Hartman To: stable@vger.kernel.org, lee@kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Bjorn Andersson , Krzysztof Kozlowski Subject: [PATCH 4.14 24/48] rpmsg: Fix kfree() of static memory on setting driver_override Date: Mon, 6 Nov 2023 14:03:15 +0100 Message-ID: <20231106130258.691643608@linuxfoundation.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231106130257.862199836@linuxfoundation.org> References: <20231106130257.862199836@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 4.14-stable review patch. If anyone has any objections, please let me know. ------------------ From: Krzysztof Kozlowski commit 42cd402b8fd4672b692400fe5f9eecd55d2794ac upstream. The driver_override field from platform driver should not be initialized from static memory (string literal) because the core later kfree() it, for example when driver_override is set via sysfs. Use dedicated helper to set driver_override properly. Fixes: 950a7388f02b ("rpmsg: Turn name service into a stand alone driver") Fixes: c0cdc19f84a4 ("rpmsg: Driver for user space endpoint interface") Reviewed-by: Bjorn Andersson Signed-off-by: Krzysztof Kozlowski Link: https://lore.kernel.org/r/20220419113435.246203-13-krzysztof.kozlowski@linaro.org Signed-off-by: Greg Kroah-Hartman Signed-off-by: Lee Jones Signed-off-by: Greg Kroah-Hartman --- drivers/rpmsg/rpmsg_internal.h | 13 +++++++++++-- include/linux/rpmsg.h | 6 ++++-- 2 files changed, 15 insertions(+), 4 deletions(-) --- a/drivers/rpmsg/rpmsg_internal.h +++ b/drivers/rpmsg/rpmsg_internal.h @@ -91,10 +91,19 @@ struct device *rpmsg_find_device(struct */ static inline int rpmsg_chrdev_register_device(struct rpmsg_device *rpdev) { + int ret; + strcpy(rpdev->id.name, "rpmsg_chrdev"); - rpdev->driver_override = "rpmsg_chrdev"; + ret = driver_set_override(&rpdev->dev, &rpdev->driver_override, + rpdev->id.name, strlen(rpdev->id.name)); + if (ret) + return ret; + + ret = rpmsg_register_device(rpdev); + if (ret) + kfree(rpdev->driver_override); - return rpmsg_register_device(rpdev); + return ret; } #endif --- a/include/linux/rpmsg.h +++ b/include/linux/rpmsg.h @@ -66,7 +66,9 @@ struct rpmsg_channel_info { * rpmsg_device - device that belong to the rpmsg bus * @dev: the device struct * @id: device id (used to match between rpmsg drivers and devices) - * @driver_override: driver name to force a match + * @driver_override: driver name to force a match; do not set directly, + * because core frees it; use driver_set_override() to + * set or clear it. * @src: local address * @dst: destination address * @ept: the rpmsg endpoint of this channel @@ -75,7 +77,7 @@ struct rpmsg_channel_info { struct rpmsg_device { struct device dev; struct rpmsg_device_id id; - char *driver_override; + const char *driver_override; u32 src; u32 dst; struct rpmsg_endpoint *ept;