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 8AFC11A2860; Tue, 8 Apr 2025 12:45:13 +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=1744116313; cv=none; b=BseGY3Bew2E0r5fWAX93zksQcHhjH2spo7veo7i0Zr2EfrYmrkYgw9zj8qCjCveufGfp53no1aYJRgzdFR1qeCm1oEZEQGRFpwtg7amqIjAdDxjkVxEXXSHQxs+50B7OmWvJTmIPaJukgf6aFA1eGHj8LJk8/nD7p4H271ElfKo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744116313; c=relaxed/simple; bh=6iyKtP5CI3TDKInMrEPUF3f18hKOffZgjqCAL9QkPko=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=NtM4zLVRVuDZi3QqzC60EniGjWY0Rb/XzPiipkpsxPpnIfFGc7EcePG87PQyYfTDDj3p9VXfgFdDEwsfgR7RXx//SN1Nfi207NwEg5n03SOpkBt5RqivoENwy/uXRUJNLBtTZ1WF6O6l+6rAHgNSswk/a7oIfnsXIkWOfjIGbJs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=sA7cjcOu; 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="sA7cjcOu" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0FFD7C4CEE5; Tue, 8 Apr 2025 12:45:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1744116313; bh=6iyKtP5CI3TDKInMrEPUF3f18hKOffZgjqCAL9QkPko=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=sA7cjcOuuY1nSmGAFQG4xhMrBRBwS3hSS9IgiKeaLNXvoH4bDS6DGAduNq8UvG2MA dPK+1WcIYTDhSScxQddZb/RTzVxFpqEOM44YgTTky5paTpYHKgXkJ4MNyE3GDuFOXp M57P8jRFvGLAMNpz5CEIMoAYU/WMO92TAEqhe6ag= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Louis Chauvet , =?UTF-8?q?Jos=C3=A9=20Exp=C3=B3sito?= , Thomas Zimmermann , Sasha Levin Subject: [PATCH 6.12 054/423] drm/vkms: Fix use after free and double free on init error Date: Tue, 8 Apr 2025 12:46:20 +0200 Message-ID: <20250408104847.009236929@linuxfoundation.org> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250408104845.675475678@linuxfoundation.org> References: <20250408104845.675475678@linuxfoundation.org> User-Agent: quilt/0.68 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-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: José Expósito [ Upstream commit ed15511a773df86205bda66c37193569575ae828 ] If the driver initialization fails, the vkms_exit() function might access an uninitialized or freed default_config pointer and it might double free it. Fix both possible errors by initializing default_config only when the driver initialization succeeded. Reported-by: Louis Chauvet Closes: https://lore.kernel.org/all/Z5uDHcCmAwiTsGte@louis-chauvet-laptop/ Fixes: 2df7af93fdad ("drm/vkms: Add vkms_config type") Signed-off-by: José Expósito Reviewed-by: Thomas Zimmermann Reviewed-by: Louis Chauvet Link: https://patchwork.freedesktop.org/patch/msgid/20250212084912.3196-1-jose.exposito89@gmail.com Signed-off-by: Louis Chauvet Signed-off-by: Sasha Levin --- drivers/gpu/drm/vkms/vkms_drv.c | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-) diff --git a/drivers/gpu/drm/vkms/vkms_drv.c b/drivers/gpu/drm/vkms/vkms_drv.c index 0c1a713b7b7b3..be642ee739c4f 100644 --- a/drivers/gpu/drm/vkms/vkms_drv.c +++ b/drivers/gpu/drm/vkms/vkms_drv.c @@ -245,17 +245,19 @@ static int __init vkms_init(void) if (!config) return -ENOMEM; - default_config = config; - config->cursor = enable_cursor; config->writeback = enable_writeback; config->overlay = enable_overlay; ret = vkms_create(config); - if (ret) + if (ret) { kfree(config); + return ret; + } - return ret; + default_config = config; + + return 0; } static void vkms_destroy(struct vkms_config *config) @@ -279,9 +281,10 @@ static void vkms_destroy(struct vkms_config *config) static void __exit vkms_exit(void) { - if (default_config->dev) - vkms_destroy(default_config); + if (!default_config) + return; + vkms_destroy(default_config); kfree(default_config); } -- 2.39.5