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 71564134CE for ; Mon, 26 Jun 2023 18:26:09 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E801AC433C0; Mon, 26 Jun 2023 18:26:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1687803969; bh=AlyljVhLcoW6ffreaLuFfYb+N+jU/OaKfpzfPbWU+p4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=P7qWdTc/R8Qu3C+d027ZAI/nz6KpmJ6E5D2sYt0cZgyzug9RZ6op2NNev+MS0ASu2 ddj7kIo5H8g+TumoQL9qI9hcnn1o0kNMAId9up3eJlZfrITk5+sNexl+It6yhDuIxm aF73tBDQ1QF4T4KouSenIASQ8SYgPu64VZrILKKc= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, =?UTF-8?q?Christian=20K=C3=B6nig?= , Min Li , Alex Deucher , Sasha Levin Subject: [PATCH 4.19 39/41] drm/radeon: fix race condition UAF in radeon_gem_set_domain_ioctl Date: Mon, 26 Jun 2023 20:12:02 +0200 Message-ID: <20230626180737.722844231@linuxfoundation.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230626180736.243379844@linuxfoundation.org> References: <20230626180736.243379844@linuxfoundation.org> User-Agent: quilt/0.67 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 From: Min Li [ Upstream commit 982b173a6c6d9472730c3116051977e05d17c8c5 ] Userspace can race to free the gobj(robj converted from), robj should not be accessed again after drm_gem_object_put, otherwith it will result in use-after-free. Reviewed-by: Christian König Signed-off-by: Min Li Signed-off-by: Alex Deucher Signed-off-by: Sasha Levin --- drivers/gpu/drm/radeon/radeon_gem.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/drivers/gpu/drm/radeon/radeon_gem.c b/drivers/gpu/drm/radeon/radeon_gem.c index 27d8e7dd2d067..46f7789693ea0 100644 --- a/drivers/gpu/drm/radeon/radeon_gem.c +++ b/drivers/gpu/drm/radeon/radeon_gem.c @@ -377,7 +377,6 @@ int radeon_gem_set_domain_ioctl(struct drm_device *dev, void *data, struct radeon_device *rdev = dev->dev_private; struct drm_radeon_gem_set_domain *args = data; struct drm_gem_object *gobj; - struct radeon_bo *robj; int r; /* for now if someone requests domain CPU - @@ -390,13 +389,12 @@ int radeon_gem_set_domain_ioctl(struct drm_device *dev, void *data, up_read(&rdev->exclusive_lock); return -ENOENT; } - robj = gem_to_radeon_bo(gobj); r = radeon_gem_set_domain(gobj, args->read_domains, args->write_domain); drm_gem_object_put_unlocked(gobj); up_read(&rdev->exclusive_lock); - r = radeon_gem_handle_lockup(robj->rdev, r); + r = radeon_gem_handle_lockup(rdev, r); return r; } -- 2.39.2