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Date:   Tue,  3 May 2022 18:44:21 -0700
From:   Kees Cook <keescook@...omium.org>
To:     "Gustavo A . R . Silva" <gustavoars@...nel.org>
Cc:     Kees Cook <keescook@...omium.org>,
        Johannes Berg <johannes@...solutions.net>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        Alexei Starovoitov <ast@...nel.org>,
        alsa-devel@...a-project.org, Al Viro <viro@...iv.linux.org.uk>,
        Andrew Gabbasov <andrew_gabbasov@...tor.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andy Gross <agross@...nel.org>,
        Andy Lavr <andy.lavr@...il.com>,
        Arend van Spriel <aspriel@...il.com>,
        Baowen Zheng <baowen.zheng@...igine.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Bradley Grove <linuxdrivers@...otech.com>,
        brcm80211-dev-list.pdl@...adcom.com,
        Christian Brauner <brauner@...nel.org>,
        Christian Göttsche <cgzones@...glemail.com>,
        Christian Lamparter <chunkeey@...glemail.com>,
        Chris Zankel <chris@...kel.net>,
        Cong Wang <cong.wang@...edance.com>,
        Daniel Axtens <dja@...ens.net>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Dan Williams <dan.j.williams@...el.com>,
        David Gow <davidgow@...gle.com>,
        David Howells <dhowells@...hat.com>,
        Dennis Dalessandro <dennis.dalessandro@...nelisnetworks.com>,
        devicetree@...r.kernel.org, Dexuan Cui <decui@...rosoft.com>,
        Dmitry Kasatkin <dmitry.kasatkin@...il.com>,
        Eli Cohen <elic@...dia.com>,
        Eric Paris <eparis@...isplace.org>,
        Eugeniu Rosca <erosca@...adit-jv.com>,
        Felipe Balbi <balbi@...nel.org>,
        Francis Laniel <laniel_francis@...vacyrequired.com>,
        Frank Rowand <frowand.list@...il.com>,
        Franky Lin <franky.lin@...adcom.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Gregory Greenman <gregory.greenman@...el.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Hante Meuleman <hante.meuleman@...adcom.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Hulk Robot <hulkci@...wei.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        James Morris <jmorris@...ei.org>,
        Jarkko Sakkinen <jarkko@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Jason Gunthorpe <jgg@...pe.ca>, Jens Axboe <axboe@...nel.dk>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Johannes Berg <johannes.berg@...el.com>,
        John Keeping <john@...anate.com>,
        Juergen Gross <jgross@...e.com>, Kalle Valo <kvalo@...nel.org>,
        Keith Packard <keithp@...thp.com>, keyrings@...r.kernel.org,
        kunit-dev@...glegroups.com,
        Kuniyuki Iwashima <kuniyu@...zon.co.jp>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Lee Jones <lee.jones@...aro.org>,
        Leon Romanovsky <leon@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        linux1394-devel@...ts.sourceforge.net,
        linux-afs@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org, linux-bluetooth@...r.kernel.org,
        linux-hardening@...r.kernel.org, linux-hyperv@...r.kernel.org,
        linux-integrity@...r.kernel.org, linux-rdma@...r.kernel.org,
        linux-scsi@...r.kernel.org, linux-security-module@...r.kernel.org,
        linux-usb@...r.kernel.org, linux-xtensa@...ux-xtensa.org,
        llvm@...ts.linux.dev, Loic Poulain <loic.poulain@...aro.org>,
        Louis Peens <louis.peens@...igine.com>,
        Luca Coelho <luciano.coelho@...el.com>,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>,
        Marc Dionne <marc.dionne@...istor.com>,
        Marcel Holtmann <marcel@...tmann.org>,
        Mark Brown <broonie@...nel.org>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Max Filippov <jcmvbkbc@...il.com>,
        Mimi Zohar <zohar@...ux.ibm.com>,
        Muchun Song <songmuchun@...edance.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nuno Sá <nuno.sa@...log.com>,
        Paul Moore <paul@...l-moore.com>,
        Rich Felker <dalias@...ifal.cx>,
        Rob Herring <robh+dt@...nel.org>,
        Russell King <linux@...linux.org.uk>, selinux@...r.kernel.org,
        "Serge E. Hallyn" <serge@...lyn.com>,
        SHA-cyfmac-dev-list@...ineon.com,
        Simon Horman <simon.horman@...igine.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Stefan Richter <stefanr@...6.in-berlin.de>,
        Steffen Klassert <steffen.klassert@...unet.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Stephen Smalley <stephen.smalley.work@...il.com>,
        Tadeusz Struk <tadeusz.struk@...aro.org>,
        Takashi Iwai <tiwai@...e.com>, Tom Rix <trix@...hat.com>,
        Udipto Goswami <quic_ugoswami@...cinc.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        wcn36xx@...ts.infradead.org, Wei Liu <wei.liu@...nel.org>,
        xen-devel@...ts.xenproject.org,
        Xiu Jianfeng <xiujianfeng@...wei.com>,
        Yang Yingliang <yangyingliang@...wei.com>
Subject: [PATCH 12/32] cfg80211: Use mem_to_flex_dup() with struct cfg80211_bss_ies

As part of the work to perform bounds checking on all memcpy() uses,
replace the open-coded a deserialization of bytes out of memory into a
trailing flexible array by using a flex_array.h helper to perform the
allocation, bounds checking, and copying.

Cc: Johannes Berg <johannes@...solutions.net>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Jakub Kicinski <kuba@...nel.org>
Cc: Paolo Abeni <pabeni@...hat.com>
Cc: Eric Dumazet <edumazet@...gle.com>
Cc: linux-wireless@...r.kernel.org
Cc: netdev@...r.kernel.org
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 include/net/cfg80211.h |  4 ++--
 net/wireless/scan.c    | 21 ++++++---------------
 2 files changed, 8 insertions(+), 17 deletions(-)

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 68713388b617..fa236015f6ef 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -2600,9 +2600,9 @@ struct cfg80211_inform_bss {
 struct cfg80211_bss_ies {
 	u64 tsf;
 	struct rcu_head rcu_head;
-	int len;
+	DECLARE_FLEX_ARRAY_ELEMENTS_COUNT(int, len);
 	bool from_beacon;
-	u8 data[];
+	DECLARE_FLEX_ARRAY_ELEMENTS(u8, data);
 };
 
 /**
diff --git a/net/wireless/scan.c b/net/wireless/scan.c
index 4a6d86432910..9f53d05c6aaa 100644
--- a/net/wireless/scan.c
+++ b/net/wireless/scan.c
@@ -1932,7 +1932,7 @@ cfg80211_inform_single_bss_data(struct wiphy *wiphy,
 				gfp_t gfp)
 {
 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
-	struct cfg80211_bss_ies *ies;
+	struct cfg80211_bss_ies *ies = NULL;
 	struct ieee80211_channel *channel;
 	struct cfg80211_internal_bss tmp = {}, *res;
 	int bss_type;
@@ -1978,13 +1978,10 @@ cfg80211_inform_single_bss_data(struct wiphy *wiphy,
 	 * override the IEs pointer should we have received an earlier
 	 * indication of Probe Response data.
 	 */
-	ies = kzalloc(sizeof(*ies) + ielen, gfp);
-	if (!ies)
+	if (mem_to_flex_dup(&ies, ie, ielen, gfp))
 		return NULL;
-	ies->len = ielen;
 	ies->tsf = tsf;
 	ies->from_beacon = false;
-	memcpy(ies->data, ie, ielen);
 
 	switch (ftype) {
 	case CFG80211_BSS_FTYPE_BEACON:
@@ -2277,7 +2274,7 @@ cfg80211_update_notlisted_nontrans(struct wiphy *wiphy,
 	size_t ielen = len - offsetof(struct ieee80211_mgmt,
 				      u.probe_resp.variable);
 	size_t new_ie_len;
-	struct cfg80211_bss_ies *new_ies;
+	struct cfg80211_bss_ies *new_ies = NULL;
 	const struct cfg80211_bss_ies *old;
 	u8 cpy_len;
 
@@ -2314,8 +2311,7 @@ cfg80211_update_notlisted_nontrans(struct wiphy *wiphy,
 	if (!new_ie)
 		return;
 
-	new_ies = kzalloc(sizeof(*new_ies) + new_ie_len, GFP_ATOMIC);
-	if (!new_ies)
+	if (mem_to_flex_dup(&new_ies, new_ie, new_ie_len, GFP_ATOMIC))
 		goto out_free;
 
 	pos = new_ie;
@@ -2333,10 +2329,8 @@ cfg80211_update_notlisted_nontrans(struct wiphy *wiphy,
 	memcpy(pos, mbssid + cpy_len, ((ie + ielen) - (mbssid + cpy_len)));
 
 	/* update ie */
-	new_ies->len = new_ie_len;
 	new_ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
 	new_ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control);
-	memcpy(new_ies->data, new_ie, new_ie_len);
 	if (ieee80211_is_probe_resp(mgmt->frame_control)) {
 		old = rcu_access_pointer(nontrans_bss->proberesp_ies);
 		rcu_assign_pointer(nontrans_bss->proberesp_ies, new_ies);
@@ -2363,7 +2357,7 @@ cfg80211_inform_single_bss_frame_data(struct wiphy *wiphy,
 				      gfp_t gfp)
 {
 	struct cfg80211_internal_bss tmp = {}, *res;
-	struct cfg80211_bss_ies *ies;
+	struct cfg80211_bss_ies *ies = NULL;
 	struct ieee80211_channel *channel;
 	bool signal_valid;
 	struct ieee80211_ext *ext = NULL;
@@ -2442,14 +2436,11 @@ cfg80211_inform_single_bss_frame_data(struct wiphy *wiphy,
 		capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
 	}
 
-	ies = kzalloc(sizeof(*ies) + ielen, gfp);
-	if (!ies)
+	if (mem_to_flex_dup(&ies, variable, ielen, gfp))
 		return NULL;
-	ies->len = ielen;
 	ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
 	ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control) ||
 			   ieee80211_is_s1g_beacon(mgmt->frame_control);
-	memcpy(ies->data, variable, ielen);
 
 	if (ieee80211_is_probe_resp(mgmt->frame_control))
 		rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
-- 
2.32.0

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