From nobody Mon Sep 29 22:37:13 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 48A41C32767 for ; Tue, 16 Aug 2022 00:04:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1356207AbiHPACG (ORCPT ); Mon, 15 Aug 2022 20:02:06 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60592 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1356367AbiHOXyO (ORCPT ); Mon, 15 Aug 2022 19:54:14 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 74FEA160130; Mon, 15 Aug 2022 13:19:04 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id ED70AB80EA8; Mon, 15 Aug 2022 20:18:57 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 416B7C433D6; Mon, 15 Aug 2022 20:18:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1660594736; bh=JYVX+japmWo6QkvwKxE7PofA1DxPVMaWjvU8+Bwxme0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qU09QDDbLYGmQUi4Iy+KfhX6AXG42VplkeDb+0Q27bXqaF6OM3zBhrIOARQ9ws2Dv aVWunW9B0pErfXCnOJ+6+/FDO2rPFqEHPYKnGBUETdVgDKUEZeQh7VLJNjRwI0LQnL Uo/fleJv0Ov7+oIcv/uF4GuwAl0G6GKdFeIK860M= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Dan Carpenter , Martin KaFai Lau , Alexei Starovoitov , Sasha Levin Subject: [PATCH 5.19 0515/1157] libbpf: fix an snprintf() overflow check Date: Mon, 15 Aug 2022 19:57:51 +0200 Message-Id: <20220815180500.290138001@linuxfoundation.org> X-Mailer: git-send-email 2.37.2 In-Reply-To: <20220815180439.416659447@linuxfoundation.org> References: <20220815180439.416659447@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Dan Carpenter [ Upstream commit b77ffb30cfc5f58e957571d8541c6a7e3da19221 ] The snprintf() function returns the number of bytes it *would* have copied if there were enough space. So it can return > the sizeof(gen->attach_target). Fixes: 67234743736a ("libbpf: Generate loader program out of BPF ELF file.") Signed-off-by: Dan Carpenter Acked-by: Martin KaFai Lau Link: https://lore.kernel.org/r/YtZ+oAySqIhFl6/J@kili Signed-off-by: Alexei Starovoitov Signed-off-by: Sasha Levin --- tools/lib/bpf/gen_loader.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/lib/bpf/gen_loader.c b/tools/lib/bpf/gen_loader.c index 927745b08014..23f5c46708f8 100644 --- a/tools/lib/bpf/gen_loader.c +++ b/tools/lib/bpf/gen_loader.c @@ -533,7 +533,7 @@ void bpf_gen__record_attach_target(struct bpf_gen *gen,= const char *attach_name, gen->attach_kind =3D kind; ret =3D snprintf(gen->attach_target, sizeof(gen->attach_target), "%s%s", prefix, attach_name); - if (ret =3D=3D sizeof(gen->attach_target)) + if (ret >=3D sizeof(gen->attach_target)) gen->error =3D -ENOSPC; } =20 --=20 2.35.1