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Date:   Tue,  3 May 2022 18:44:18 -0700
From:   Kees Cook <keescook@...omium.org>
To:     "Gustavo A . R . Silva" <gustavoars@...nel.org>
Cc:     Kees Cook <keescook@...omium.org>,
        Christian Lamparter <chunkeey@...glemail.com>,
        Kalle Valo <kvalo@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.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>,
        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>,
        Johannes Berg <johannes@...solutions.net>,
        John Keeping <john@...anate.com>,
        Juergen Gross <jgross@...e.com>,
        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 09/32] p54: Use mem_to_flex_dup() with struct p54_cal_database

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: Christian Lamparter <chunkeey@...glemail.com>
Cc: Kalle Valo <kvalo@...nel.org>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Eric Dumazet <edumazet@...gle.com>
Cc: Jakub Kicinski <kuba@...nel.org>
Cc: Paolo Abeni <pabeni@...hat.com>
Cc: linux-wireless@...r.kernel.org
Cc: netdev@...r.kernel.org
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 drivers/net/wireless/intersil/p54/eeprom.c | 8 ++------
 drivers/net/wireless/intersil/p54/p54.h    | 4 ++--
 2 files changed, 4 insertions(+), 8 deletions(-)

diff --git a/drivers/net/wireless/intersil/p54/eeprom.c b/drivers/net/wireless/intersil/p54/eeprom.c
index 5bd35c147e19..bd9b3ea327b9 100644
--- a/drivers/net/wireless/intersil/p54/eeprom.c
+++ b/drivers/net/wireless/intersil/p54/eeprom.c
@@ -702,7 +702,7 @@ static int p54_convert_output_limits(struct ieee80211_hw *dev,
 static struct p54_cal_database *p54_convert_db(struct pda_custom_wrapper *src,
 					       size_t total_len)
 {
-	struct p54_cal_database *dst;
+	struct p54_cal_database *dst = NULL;
 	size_t payload_len, entries, entry_size, offset;
 
 	payload_len = le16_to_cpu(src->len);
@@ -713,16 +713,12 @@ static struct p54_cal_database *p54_convert_db(struct pda_custom_wrapper *src,
 	     (payload_len + sizeof(*src) != total_len))
 		return NULL;
 
-	dst = kmalloc(sizeof(*dst) + payload_len, GFP_KERNEL);
-	if (!dst)
+	if (mem_to_flex_dup(&dst, src->data, payload_len, GFP_KERNEL))
 		return NULL;
 
 	dst->entries = entries;
 	dst->entry_size = entry_size;
 	dst->offset = offset;
-	dst->len = payload_len;
-
-	memcpy(dst->data, src->data, payload_len);
 	return dst;
 }
 
diff --git a/drivers/net/wireless/intersil/p54/p54.h b/drivers/net/wireless/intersil/p54/p54.h
index 3356ea708d81..22bbb6d28245 100644
--- a/drivers/net/wireless/intersil/p54/p54.h
+++ b/drivers/net/wireless/intersil/p54/p54.h
@@ -125,8 +125,8 @@ struct p54_cal_database {
 	size_t entries;
 	size_t entry_size;
 	size_t offset;
-	size_t len;
-	u8 data[];
+	DECLARE_FLEX_ARRAY_ELEMENTS_COUNT(size_t, len);
+	DECLARE_FLEX_ARRAY_ELEMENTS(u8, data);
 };
 
 #define EEPROM_READBACK_LEN 0x3fc
-- 
2.32.0

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