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Date:   Tue,  3 May 2022 18:44:33 -0700
From:   Kees Cook <keescook@...omium.org>
To:     "Gustavo A . R . Silva" <gustavoars@...nel.org>
Cc:     Kees Cook <keescook@...omium.org>,
        Dennis Dalessandro <dennis.dalessandro@...nelisnetworks.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Leon Romanovsky <leon@...nel.org>, linux-rdma@...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>,
        "David S. Miller" <davem@...emloft.net>,
        devicetree@...r.kernel.org, Dexuan Cui <decui@...rosoft.com>,
        Dmitry Kasatkin <dmitry.kasatkin@...il.com>,
        Eli Cohen <elic@...dia.com>,
        Eric Dumazet <edumazet@...gle.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>,
        Jakub Kicinski <kuba@...nel.org>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        James Morris <jmorris@...ei.org>,
        Jarkko Sakkinen <jarkko@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>, 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>, 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>,
        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-scsi@...r.kernel.org,
        linux-security-module@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-wireless@...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>, netdev@...r.kernel.org,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nuno Sá <nuno.sa@...log.com>,
        Paolo Abeni <pabeni@...hat.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 24/32] IB/hfi1: Use mem_to_flex_dup() for struct tid_rb_node

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: Dennis Dalessandro <dennis.dalessandro@...nelisnetworks.com>
Cc: Jason Gunthorpe <jgg@...pe.ca>
Cc: Leon Romanovsky <leon@...nel.org>
Cc: linux-rdma@...r.kernel.org
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 drivers/infiniband/hw/hfi1/user_exp_rcv.c | 7 ++-----
 drivers/infiniband/hw/hfi1/user_exp_rcv.h | 4 ++--
 2 files changed, 4 insertions(+), 7 deletions(-)

diff --git a/drivers/infiniband/hw/hfi1/user_exp_rcv.c b/drivers/infiniband/hw/hfi1/user_exp_rcv.c
index 186d30291260..f14846662ac9 100644
--- a/drivers/infiniband/hw/hfi1/user_exp_rcv.c
+++ b/drivers/infiniband/hw/hfi1/user_exp_rcv.c
@@ -683,7 +683,7 @@ static int set_rcvarray_entry(struct hfi1_filedata *fd,
 {
 	int ret;
 	struct hfi1_ctxtdata *uctxt = fd->uctxt;
-	struct tid_rb_node *node;
+	struct tid_rb_node *node = NULL;
 	struct hfi1_devdata *dd = uctxt->dd;
 	dma_addr_t phys;
 	struct page **pages = tbuf->pages + pageidx;
@@ -692,8 +692,7 @@ static int set_rcvarray_entry(struct hfi1_filedata *fd,
 	 * Allocate the node first so we can handle a potential
 	 * failure before we've programmed anything.
 	 */
-	node = kzalloc(struct_size(node, pages, npages), GFP_KERNEL);
-	if (!node)
+	if (mem_to_flex_dup(&node, pages, npages, GFP_KERNEL))
 		return -ENOMEM;
 
 	phys = dma_map_single(&dd->pcidev->dev, __va(page_to_phys(pages[0])),
@@ -707,12 +706,10 @@ static int set_rcvarray_entry(struct hfi1_filedata *fd,
 
 	node->fdata = fd;
 	node->phys = page_to_phys(pages[0]);
-	node->npages = npages;
 	node->rcventry = rcventry;
 	node->dma_addr = phys;
 	node->grp = grp;
 	node->freed = false;
-	memcpy(node->pages, pages, flex_array_size(node, pages, npages));
 
 	if (fd->use_mn) {
 		ret = mmu_interval_notifier_insert(
diff --git a/drivers/infiniband/hw/hfi1/user_exp_rcv.h b/drivers/infiniband/hw/hfi1/user_exp_rcv.h
index 8c53e416bf84..4be3446c4d25 100644
--- a/drivers/infiniband/hw/hfi1/user_exp_rcv.h
+++ b/drivers/infiniband/hw/hfi1/user_exp_rcv.h
@@ -32,8 +32,8 @@ struct tid_rb_node {
 	u32 rcventry;
 	dma_addr_t dma_addr;
 	bool freed;
-	unsigned int npages;
-	struct page *pages[];
+	DECLARE_FLEX_ARRAY_ELEMENTS_COUNT(unsigned int, npages);
+	DECLARE_FLEX_ARRAY_ELEMENTS(struct page *, pages);
 };
 
 static inline int num_user_pages(unsigned long addr,
-- 
2.32.0

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