From patchwork Wed May 29 17:36:06 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrii Nakryiko X-Patchwork-Id: 1107281 X-Patchwork-Delegate: bpf@iogearbox.net Return-Path: X-Original-To: incoming-bpf@patchwork.ozlabs.org Delivered-To: patchwork-incoming-bpf@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=bpf-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=pass (p=none dis=none) header.from=fb.com Authentication-Results: ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=fb.com header.i=@fb.com header.b="BwrU1TeH"; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 45DdDY0bJcz9s7h for ; Thu, 30 May 2019 03:36:29 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726830AbfE2Rg2 (ORCPT ); Wed, 29 May 2019 13:36:28 -0400 Received: from mx0a-00082601.pphosted.com ([67.231.145.42]:48508 "EHLO mx0a-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726704AbfE2Rg2 (ORCPT ); Wed, 29 May 2019 13:36:28 -0400 Received: from pps.filterd (m0109333.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x4THTiC8027606 for ; Wed, 29 May 2019 10:36:27 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fb.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-type; s=facebook; bh=eGbv96CIVNq6Un/qXd+T5R3sXa8m83HVhhVkjolwqxU=; b=BwrU1TeHnuZCyuWN5HkQDACUQsxLVk4jEoWEE/CuSoiDjDCiUpoJF7EFV/6lWwDyTjB0 uFa6ZcGxAJJe9R01fMakDa1Miu5M31tjcWaM7r/ZnO/9Dpl8A67/z3meqVtsFGZ8o/cq z2LBLqzn62tBrXY8p3W3cMSAvtrlV+Od3pE= Received: from mail.thefacebook.com (mailout.thefacebook.com [199.201.64.23]) by mx0a-00082601.pphosted.com with ESMTP id 2sswbt0adg-7 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-SHA384 bits=256 verify=NOT) for ; Wed, 29 May 2019 10:36:27 -0700 Received: from mx-out.facebook.com (2620:10d:c081:10::13) by mail.thefacebook.com (2620:10d:c081:35::126) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA) id 15.1.1713.5; Wed, 29 May 2019 10:36:24 -0700 Received: by dev101.prn2.facebook.com (Postfix, from userid 137359) id AE56B8617AE; Wed, 29 May 2019 10:36:23 -0700 (PDT) Smtp-Origin-Hostprefix: dev From: Andrii Nakryiko Smtp-Origin-Hostname: dev101.prn2.facebook.com To: , , , , , CC: Andrii Nakryiko Smtp-Origin-Cluster: prn2c23 Subject: [PATCH v2 bpf-next 4/9] libbpf: check map name retrieved from ELF Date: Wed, 29 May 2019 10:36:06 -0700 Message-ID: <20190529173611.4012579-5-andriin@fb.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190529173611.4012579-1-andriin@fb.com> References: <20190529173611.4012579-1-andriin@fb.com> X-FB-Internal: Safe MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-05-29_09:, , signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1905290114 X-FB-Internal: deliver Sender: bpf-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org Validate there was no error retrieving symbol name corresponding to a BPF map. Acked-by: Song Liu Signed-off-by: Andrii Nakryiko --- tools/lib/bpf/libbpf.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c index fe700ef1135d..e3c0144e454f 100644 --- a/tools/lib/bpf/libbpf.c +++ b/tools/lib/bpf/libbpf.c @@ -920,6 +920,11 @@ bpf_object__init_maps(struct bpf_object *obj, int flags) map_name = elf_strptr(obj->efile.elf, obj->efile.strtabidx, sym.st_name); + if (!map_name) { + pr_warning("failed to get map #%d name sym string for obj %s\n", + map_idx, obj->path); + return -LIBBPF_ERRNO__FORMAT; + } obj->maps[map_idx].libbpf_type = LIBBPF_MAP_UNSPEC; obj->maps[map_idx].offset = sym.st_value;