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 E1AD67482; Mon, 23 Jun 2025 21:16:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750713366; cv=none; b=W2mnYZSz4ExJT1QgRjl+Tpv0EI3lq26eoqSzeySFS+tGjn9mLJ5Hso5MmbqkxFoAVg3xBJK/D9N6Dt93fjTO6Er8loenKeJJPw44EQr6uZ3K7QiL+tnJ4luAWTTMzN2IRgsIi/qSXwNKuwQqh+MBvGRWw+iE5PJ4YaFsb2MmDrY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750713366; c=relaxed/simple; bh=uXiiwzssqjyGYsb0jtiDVGNvaiy0s/MuuyA/CE4rLec=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=j//KrRf4ugCmxI7x9jRtdJ+S4Yeu+9H9zx/N0HpKavQQs0ZmuqE0whbudm++d7RzglFhTptFabF40vJvBht6S4MTCUK9lcPNbdJ9+s5PMmHUVjGDI7Y+NYW2JCkSSx1IT5YhJQIMa4B2jGp4W8yxFI/OFEL7KfAUsxdyCKRbSaw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=sqDLhAfg; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="sqDLhAfg" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 71165C4CEEA; Mon, 23 Jun 2025 21:16:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1750713365; bh=uXiiwzssqjyGYsb0jtiDVGNvaiy0s/MuuyA/CE4rLec=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=sqDLhAfg9MY4jE1hUeGt6bR6ZdFGFbvx3cfSpaIdbzjzJU9Q2mu5gadNiZm0uZZZE kJxG1t4pDEkGbgP89iGOvHEhMiOm31pm2pebjfLmg7334r3/u6tAvqsJOaHqQrOIFI 2E/2gfBK0qEvxfWzb2C8f75osPOzvyX86KOLueEY= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Andrii Nakryiko , Anton Protopopov , Sasha Levin Subject: [PATCH 6.1 080/508] libbpf: Use proper errno value in nlattr Date: Mon, 23 Jun 2025 15:02:05 +0200 Message-ID: <20250623130647.205862035@linuxfoundation.org> X-Mailer: git-send-email 2.50.0 In-Reply-To: <20250623130645.255320792@linuxfoundation.org> References: <20250623130645.255320792@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Anton Protopopov [ Upstream commit fd5fd538a1f4b34cee6823ba0ddda2f7a55aca96 ] Return value of the validate_nla() function can be propagated all the way up to users of libbpf API. In case of error this libbpf version of validate_nla returns -1 which will be seen as -EPERM from user's point of view. Instead, return a more reasonable -EINVAL. Fixes: bbf48c18ee0c ("libbpf: add error reporting in XDP") Suggested-by: Andrii Nakryiko Signed-off-by: Anton Protopopov Signed-off-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20250510182011.2246631-1-a.s.protopopov@gmail.com Signed-off-by: Sasha Levin --- tools/lib/bpf/nlattr.c | 15 +++++++-------- 1 file changed, 7 insertions(+), 8 deletions(-) diff --git a/tools/lib/bpf/nlattr.c b/tools/lib/bpf/nlattr.c index 975e265eab3bf..06663f9ea581f 100644 --- a/tools/lib/bpf/nlattr.c +++ b/tools/lib/bpf/nlattr.c @@ -63,16 +63,16 @@ static int validate_nla(struct nlattr *nla, int maxtype, minlen = nla_attr_minlen[pt->type]; if (libbpf_nla_len(nla) < minlen) - return -1; + return -EINVAL; if (pt->maxlen && libbpf_nla_len(nla) > pt->maxlen) - return -1; + return -EINVAL; if (pt->type == LIBBPF_NLA_STRING) { char *data = libbpf_nla_data(nla); if (data[libbpf_nla_len(nla) - 1] != '\0') - return -1; + return -EINVAL; } return 0; @@ -118,19 +118,18 @@ int libbpf_nla_parse(struct nlattr *tb[], int maxtype, struct nlattr *head, if (policy) { err = validate_nla(nla, maxtype, policy); if (err < 0) - goto errout; + return err; } - if (tb[type]) + if (tb[type]) { pr_warn("Attribute of type %#x found multiple times in message, " "previous attribute is being ignored.\n", type); + } tb[type] = nla; } - err = 0; -errout: - return err; + return 0; } /** -- 2.39.5