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Message-Id: <20220504014440.3697851-18-keescook@chromium.org>
Date: Tue, 3 May 2022 18:44:26 -0700
From: Kees Cook <keescook@...omium.org>
To: "Gustavo A . R . Silva" <gustavoars@...nel.org>
Cc: Kees Cook <keescook@...omium.org>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Baowen Zheng <baowen.zheng@...igine.com>,
Eli Cohen <elic@...dia.com>,
Louis Peens <louis.peens@...igine.com>,
Simon Horman <simon.horman@...igine.com>,
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>,
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>,
Eric Paris <eparis@...isplace.org>,
Eugeniu Rosca <erosca@...adit-jv.com>,
Felipe Balbi <balbi@...nel.org>,
Francis Laniel <laniel_francis@...vacyrequired.com>,
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Hante Meuleman <hante.meuleman@...adcom.com>,
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"Serge E. Hallyn" <serge@...lyn.com>,
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Udipto Goswami <quic_ugoswami@...cinc.com>,
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xen-devel@...ts.xenproject.org,
Xiu Jianfeng <xiujianfeng@...wei.com>,
Yang Yingliang <yangyingliang@...wei.com>
Subject: [PATCH 17/32] net/flow_offload: Use mem_to_flex_dup() with struct flow_action_cookie
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: "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: Baowen Zheng <baowen.zheng@...igine.com>
Cc: Eli Cohen <elic@...dia.com>
Cc: Louis Peens <louis.peens@...igine.com>
Cc: Simon Horman <simon.horman@...igine.com>
Cc: netdev@...r.kernel.org
Signed-off-by: Kees Cook <keescook@...omium.org>
---
include/net/flow_offload.h | 4 ++--
net/core/flow_offload.c | 7 ++-----
2 files changed, 4 insertions(+), 7 deletions(-)
diff --git a/include/net/flow_offload.h b/include/net/flow_offload.h
index 021778a7e1af..ca5db457a0bc 100644
--- a/include/net/flow_offload.h
+++ b/include/net/flow_offload.h
@@ -190,8 +190,8 @@ enum flow_action_hw_stats {
typedef void (*action_destr)(void *priv);
struct flow_action_cookie {
- u32 cookie_len;
- u8 cookie[];
+ DECLARE_FLEX_ARRAY_ELEMENTS_COUNT(u32, cookie_len);
+ DECLARE_FLEX_ARRAY_ELEMENTS(u8, cookie);
};
struct flow_action_cookie *flow_action_cookie_create(void *data,
diff --git a/net/core/flow_offload.c b/net/core/flow_offload.c
index 73f68d4625f3..e23c8d05b828 100644
--- a/net/core/flow_offload.c
+++ b/net/core/flow_offload.c
@@ -199,13 +199,10 @@ struct flow_action_cookie *flow_action_cookie_create(void *data,
unsigned int len,
gfp_t gfp)
{
- struct flow_action_cookie *cookie;
+ struct flow_action_cookie *cookie = NULL;
- cookie = kmalloc(sizeof(*cookie) + len, gfp);
- if (!cookie)
+ if (mem_to_flex_dup(&cookie, data, len, gfp))
return NULL;
- cookie->cookie_len = len;
- memcpy(cookie->cookie, data, len);
return cookie;
}
EXPORT_SYMBOL(flow_action_cookie_create);
--
2.32.0
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