From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 757B03892015; Wed, 13 May 2020 20:24:28 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 757B03892015 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1589401468; bh=rWbxBqR7dpqwgUg8N0dBmvIej1XCwrcq2/zhSXByVrE=; h=From:To:Subject:Date:In-Reply-To:References:From; b=GY87NwQkFWNqZ3wXafMlnBaUNMCoqMTk3AFYjqf+1AkTkbPQGtVvopV4/4EjnmY0/ wyLyva3/x7H5TKE5K6a0Njk2WCleJKVtKAbMRbXqARqungIeMJ/KNGvKxBONtH71Nv EKEVxHghsrf1etp7VlSnAMoSYjxbXvSQcQqAbXMk= From: "avi@cloudius-systems.com" To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/95111] coroutines use-after-free with lambdas Date: Wed, 13 May 2020 20:24:28 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: c++ X-Bugzilla-Version: 10.1.1 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: avi@cloudius-systems.com X-Bugzilla-Status: UNCONFIRMED X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: iains at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: gcc-bugs@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc-bugs mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 13 May 2020 20:24:28 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D95111 --- Comment #10 from Avi Kivity --- Well, the standard is useless here. In [foo] () -> lazy { co_return foo; } () a temporary is clearly passed to the lambda body, yet the standard mandates that we capture it by reference. As a result, a use-after-free is guarantee= d.=