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GET /api/patches/2225868/?format=api
{ "id": 2225868, "url": "http://patchwork.ozlabs.org/api/patches/2225868/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/patch/aeeztiQrDfqssPGq@tucnak/", "project": { "id": 17, "url": "http://patchwork.ozlabs.org/api/projects/17/?format=api", "name": "GNU Compiler Collection", "link_name": "gcc", "list_id": "gcc-patches.gcc.gnu.org", "list_email": "gcc-patches@gcc.gnu.org", "web_url": null, "scm_url": null, "webscm_url": null, "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<aeeztiQrDfqssPGq@tucnak>", "list_archive_url": null, "date": "2026-04-21T17:28:22", "name": "c-family: Fix ICE with counted_by attribute [PR124969]", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "78b6eee6042b57daf57cd8979bb3103113e354f4", "submitter": { "id": 671, "url": "http://patchwork.ozlabs.org/api/people/671/?format=api", "name": "Jakub Jelinek", "email": "jakub@redhat.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/gcc/patch/aeeztiQrDfqssPGq@tucnak/mbox/", "series": [ { "id": 500859, "url": "http://patchwork.ozlabs.org/api/series/500859/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/list/?series=500859", "date": "2026-04-21T17:28:22", "name": "c-family: Fix ICE with counted_by attribute [PR124969]", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/500859/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2225868/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2225868/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "gcc-patches@gcc.gnu.org" ], "Delivered-To": [ "patchwork-incoming@legolas.ozlabs.org", "gcc-patches@gcc.gnu.org" ], "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=N97RWOGv;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=gcc.gnu.org\n (client-ip=38.145.34.32; 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Tue, 21 Apr 2026 17:28:25 +0000 (UTC)", "from tucnak.zalov.cz (localhost [127.0.0.1])\n by tucnak.zalov.cz (8.18.1/8.18.1) with ESMTPS id 63LHSMZ2931422\n (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NOT);\n Tue, 21 Apr 2026 19:28:22 +0200", "(from jakub@localhost)\n by tucnak.zalov.cz (8.18.1/8.18.1/Submit) id 63LHSMRB931421;\n Tue, 21 Apr 2026 19:28:22 +0200" ], "DKIM-Filter": [ "OpenDKIM Filter v2.11.0 sourceware.org 2A0BA4BA2E3F", "OpenDKIM Filter v2.11.0 sourceware.org 197184BA2E3C" ], "DMARC-Filter": "OpenDMARC Filter v1.4.2 sourceware.org 197184BA2E3C", "ARC-Filter": "OpenARC Filter v1.0.0 sourceware.org 197184BA2E3C", "ARC-Seal": "i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1776792509; cv=none;\n b=J76kM+RdLmcpfTOcidVv9zsCC00mKo7PUFzV2n9+dOSKbavTA32uqIwnJsZXuNcb2oERTcrFHPm87AS3MYxbiYCAPutatu7mY/GkqHuzL6NbWnFAbdGksJQ52uGdT3NOaozbtTX3oWB858coaAX5LYxbij+tkRDwz/J0suaS6Uo=", "ARC-Message-Signature": "i=1; a=rsa-sha256; d=sourceware.org; s=key;\n t=1776792509; c=relaxed/simple;\n bh=bMFHWlJ/jerKgsap2ubY8pzgZOQ7uLrWqx/Karh7kX4=;\n h=DKIM-Signature:Date:From:To:Subject:Message-ID:MIME-Version;\n b=D8nuUdZ0W6SIoj4iBhLn62dETOOHB33P+um+l8KP4Lgg4TZW5ycwiywnaPPnNdiy6KCwizvXhURa5pp872+pesuzzYMWNgUgmL/Y57xZLLsWdMDruDyr9MNtIYfNdaKhA4+WHmFMf2M78zgAtknhOCvWjbbx5JXuRuJFhZwJK3w=", "ARC-Authentication-Results": "i=1; server2.sourceware.org", "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com;\n s=mimecast20190719; t=1776792508;\n h=from:from:reply-to:reply-to:subject:subject:date:date:\n message-id:message-id:to:to:cc:cc:mime-version:mime-version:\n content-type:content-type; bh=gRBdCwrKlUVfV/h9DHXa/TQQWgKm8gHsfeQd41UA/d0=;\n b=N97RWOGv0dnRsAnRDl6Y0B/TLDF5Z0mlZKnOXntLz23YbuNJ1KCze7UoSL4+cOezIpogfA\n No2RdB4fTDYab69xwmrq8TZT0s3s85ZsX7NyyZtvsUGsjE/ex3pIqry5A/KhdgRffbxqCx\n L1w17lnf3AU4Zypf3Gn/Qm3RTKFRYYI=", "X-MC-Unique": "BqAP4cftN4CI-rYedB-jfg-1", "X-Mimecast-MFC-AGG-ID": "BqAP4cftN4CI-rYedB-jfg_1776792506", "Date": "Tue, 21 Apr 2026 19:28:22 +0200", "From": "Jakub Jelinek <jakub@redhat.com>", "To": "\"Joseph S. Myers\" <josmyers@redhat.com>,\n Marek Polacek <polacek@redhat.com>, Jason Merrill <jason@redhat.com>,\n Richard Biener <rguenther@suse.de>", "Cc": "gcc-patches@gcc.gnu.org", "Subject": "[PATCH] c-family: Fix ICE with counted_by attribute [PR124969]", "Message-ID": "<aeeztiQrDfqssPGq@tucnak>", "MIME-Version": "1.0", "X-Scanned-By": "MIMEDefang 3.4.1 on 10.30.177.93", "X-Mimecast-Spam-Score": "0", "X-Mimecast-MFC-PROC-ID": "TpzKDB6Q5dtc8w9uAZ7kQizlZsBopToH5FjQo6JwkR4_1776792506", "X-Mimecast-Originator": "redhat.com", "Content-Type": "text/plain; charset=us-ascii", "Content-Disposition": "inline", "X-BeenThere": "gcc-patches@gcc.gnu.org", "X-Mailman-Version": "2.1.30", "Precedence": "list", "List-Id": "Gcc-patches mailing list <gcc-patches.gcc.gnu.org>", "List-Unsubscribe": "<https://gcc.gnu.org/mailman/options/gcc-patches>,\n <mailto:gcc-patches-request@gcc.gnu.org?subject=unsubscribe>", "List-Archive": "<https://gcc.gnu.org/pipermail/gcc-patches/>", "List-Post": "<mailto:gcc-patches@gcc.gnu.org>", "List-Help": "<mailto:gcc-patches-request@gcc.gnu.org?subject=help>", "List-Subscribe": "<https://gcc.gnu.org/mailman/listinfo/gcc-patches>,\n <mailto:gcc-patches-request@gcc.gnu.org?subject=subscribe>", "Reply-To": "Jakub Jelinek <jakub@redhat.com>", "Errors-To": "gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org" }, "content": "Hi!\n\nThe following valid testcase ICEs, because we try to use\nTREE_CODE (NULL_TREE).\nWe document that counted_by is supported on pointers to void\nand that it behaves like the GNU pointer to void arithmetics\nextension in that case. build_access_with_size_for_counted_by\nalready uses 1 in that case as element_size.\n\nThe following patch fixes it, plus for error recovery punts\nif it is a pointer to incomplete type other than void (pointer\narithmetics on such type will be diagnosed as error later on).\n\nOk for trunk if it passes full bootstrap/regtest?\n\n2026-04-21 Jakub Jelinek <jakub@redhat.com>\n\n\tPR sanitizer/124969\n\t* c-ubsan.cc (get_index_from_pointer_addr_expr): For\n\tVOID_TYPE_P (pointee_type) use size_one_node instead of\n\tTYPE_SIZE_UNIT (pointee_type) as pointee_size. Punt if\n\tpointee_size is NULL_TREE. Formatting fix.\n\n\t* gcc.dg/ubsan/pr124969-1.c: New test.\n\n\n\tJakub", "diff": "--- gcc/c-family/c-ubsan.cc.jj\t2026-03-27 10:17:13.716337560 +0100\n+++ gcc/c-family/c-ubsan.cc\t2026-04-21 19:02:54.261275681 +0200\n@@ -741,7 +741,11 @@ get_index_from_pointer_addr_expr (tree p\n /* Get the pointee type of the call to .ACCESS_WITH_SIZE.\n This should be the element type of the pointer array. */\n tree pointee_type = TREE_TYPE (TREE_TYPE (call));\n- tree pointee_size = TYPE_SIZE_UNIT (pointee_type);\n+ tree pointee_size;\n+ if (VOID_TYPE_P (pointee_type))\n+ pointee_size = size_one_node;\n+ else\n+ pointee_size = TYPE_SIZE_UNIT (pointee_type);\n \n tree index_exp = TREE_OPERAND (pointer, 1);\n *index_p = pointer;\n@@ -750,6 +754,8 @@ get_index_from_pointer_addr_expr (tree p\n if (!(TREE_CODE (index_exp) != MULT_EXPR\n \t&& tree_int_cst_equal (pointee_size, integer_one_node)))\n {\n+ if (pointee_size == NULL_TREE)\n+\treturn NULL_TREE;\n while (CONVERT_EXPR_CODE_P (TREE_CODE (index_exp)))\n \t{\n \t *index_p = index_exp;\n@@ -760,7 +766,7 @@ get_index_from_pointer_addr_expr (tree p\n \t\t\t\t\t index_n, pointee_size);\n \n if (!index_exp)\n- return NULL_TREE;\n+\treturn NULL_TREE;\n }\n \n while (CONVERT_EXPR_CODE_P (TREE_CODE (index_exp)))\n--- gcc/testsuite/gcc.dg/ubsan/pr124969-1.c.jj\t2026-04-21 19:18:43.197227776 +0200\n+++ gcc/testsuite/gcc.dg/ubsan/pr124969-1.c\t2026-04-21 19:19:23.288549722 +0200\n@@ -0,0 +1,14 @@\n+/* PR sanitizer/124969 */\n+/* { dg-do compile } */\n+/* { dg-options \"-fsanitize=undefined\" } */\n+\n+struct S {\n+ int c;\n+ void *b __attribute__ ((counted_by (c)));\n+} a;\n+\n+void *\n+foo (void)\n+{\n+ return a.b + 10;\n+}\n", "prefixes": [] }