From nobody Fri Nov 19 00:02:35 2021 X-Original-To: dev-commits-src-all@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id D9F76188F47C; Fri, 19 Nov 2021 00:02:36 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4HwH0r4HY2z3BmQ; Fri, 19 Nov 2021 00:02:35 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org (gitrepo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:5]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 4B2C31E4AA; Fri, 19 Nov 2021 00:02:35 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org ([127.0.1.44]) by gitrepo.freebsd.org (8.16.1/8.16.1) with ESMTP id 1AJ02ZPF072432; Fri, 19 Nov 2021 00:02:35 GMT (envelope-from git@gitrepo.freebsd.org) Received: (from git@localhost) by gitrepo.freebsd.org (8.16.1/8.16.1/Submit) id 1AJ02Z4x072431; Fri, 19 Nov 2021 00:02:35 GMT (envelope-from git) Date: Fri, 19 Nov 2021 00:02:35 GMT Message-Id: <202111190002.1AJ02Z4x072431@gitrepo.freebsd.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org From: "Bjoern A. Zeeb" Subject: git: 32c2c00e3f90 - stable/13 - net80211: correct length check in ieee80211_ies_expand() List-Id: Commit messages for all branches of the src repository List-Archive: https://lists.freebsd.org/archives/dev-commits-src-all List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-dev-commits-src-all@freebsd.org X-BeenThere: dev-commits-src-all@freebsd.org MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Git-Committer: bz X-Git-Repository: src X-Git-Refname: refs/heads/stable/13 X-Git-Reftype: branch X-Git-Commit: 32c2c00e3f90d3a01a03ebdf7131c7e300da034c Auto-Submitted: auto-generated X-ThisMailContainsUnwantedMimeParts: N The branch stable/13 has been updated by bz: URL: https://cgit.FreeBSD.org/src/commit/?id=32c2c00e3f90d3a01a03ebdf7131c7e300da034c commit 32c2c00e3f90d3a01a03ebdf7131c7e300da034c Author: Bjoern A. Zeeb AuthorDate: 2021-10-06 18:09:39 +0000 Commit: Bjoern A. Zeeb CommitDate: 2021-11-19 00:01:25 +0000 net80211: correct length check in ieee80211_ies_expand() In ieee80211_ies_expand() we are looping over Elements (also known as Information Elements or IEs). The comment suggests that we assume well-formedness of the IEs themselves. Checking the buffer length being least 2 (1 byte Element ID and 1 byte Length fields) rather than just 1 before accessing ie[1] is still good practise and can prevent and out-of-bounds read in case the input is not behaving according to the comment. Reported by: (coypu sdf.org) admbugs: 857 (cherry picked from commit 09dd08f167812a5fdb516fc98f14dbb43221432f) --- sys/net80211/ieee80211_node.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/sys/net80211/ieee80211_node.c b/sys/net80211/ieee80211_node.c index 5a9677836dbd..3ddb82343efe 100644 --- a/sys/net80211/ieee80211_node.c +++ b/sys/net80211/ieee80211_node.c @@ -1133,7 +1133,7 @@ ieee80211_ies_expand(struct ieee80211_ies *ies) ie = ies->data; ielen = ies->len; - while (ielen > 0) { + while (ielen > 1) { switch (ie[0]) { case IEEE80211_ELEMID_VENDOR: if (iswpaoui(ie))