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[PATCH 11/32] nl80211: Use mem_to_flex_dup() with struct cfg80211_cqm_config
- To: "Gustavo A . R . Silva" <gustavoars@xxxxxxxxxx>
- From: Kees Cook <keescook@xxxxxxxxxxxx>
- Date: Tue, 3 May 2022 18:44:20 -0700
- Cc: Kees Cook <keescook@xxxxxxxxxxxx>, Johannes Berg <johannes@xxxxxxxxxxxxxxxx>, "David S. Miller" <davem@xxxxxxxxxxxxx>, Jakub Kicinski <kuba@xxxxxxxxxx>, Paolo Abeni <pabeni@xxxxxxxxxx>, linux-wireless@xxxxxxxxxxxxxxx, netdev@xxxxxxxxxxxxxxx, Eric Dumazet <edumazet@xxxxxxxxxx>, Alexei Starovoitov <ast@xxxxxxxxxx>, alsa-devel@xxxxxxxxxxxxxxxx, Al Viro <viro@xxxxxxxxxxxxxxxxxx>, Andrew Gabbasov <andrew_gabbasov@xxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Andy Gross <agross@xxxxxxxxxx>, Andy Lavr <andy.lavr@xxxxxxxxx>, Arend van Spriel <aspriel@xxxxxxxxx>, Baowen Zheng <baowen.zheng@xxxxxxxxxxxx>, Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, Bradley Grove <linuxdrivers@xxxxxxxxxxxx>, brcm80211-dev-list.pdl@xxxxxxxxxxxx, Christian Brauner <brauner@xxxxxxxxxx>, Christian Göttsche <cgzones@xxxxxxxxxxxxxx>, Christian Lamparter <chunkeey@xxxxxxxxxxxxxx>, Chris Zankel <chris@xxxxxxxxxx>, Cong Wang <cong.wang@xxxxxxxxxxxxx>, Daniel Axtens <dja@xxxxxxxxxx>, Daniel Vetter <daniel.vetter@xxxxxxxx>, Dan Williams <dan.j.williams@xxxxxxxxx>, David Gow <davidgow@xxxxxxxxxx>, David Howells <dhowells@xxxxxxxxxx>, Dennis Dalessandro <dennis.dalessandro@xxxxxxxxxxxxxxxxxxxx>, devicetree@xxxxxxxxxxxxxxx, Dexuan Cui <decui@xxxxxxxxxxxxx>, Dmitry Kasatkin <dmitry.kasatkin@xxxxxxxxx>, Eli Cohen <elic@xxxxxxxxxx>, Eric Paris <eparis@xxxxxxxxxxxxxx>, Eugeniu Rosca <erosca@xxxxxxxxxxxxxx>, Felipe Balbi <balbi@xxxxxxxxxx>, Francis Laniel <laniel_francis@xxxxxxxxxxxxxxxxxxx>, Frank Rowand <frowand.list@xxxxxxxxx>, Franky Lin <franky.lin@xxxxxxxxxxxx>, Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>, Gregory Greenman <gregory.greenman@xxxxxxxxx>, Guenter Roeck <linux@xxxxxxxxxxxx>, Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>, Hante Meuleman <hante.meuleman@xxxxxxxxxxxx>, Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>, Hulk Robot <hulkci@xxxxxxxxxx>, "James E.J. Bottomley" <jejb@xxxxxxxxxxxxx>, James Morris <jmorris@xxxxxxxxx>, Jarkko Sakkinen <jarkko@xxxxxxxxxx>, Jaroslav Kysela <perex@xxxxxxxx>, Jason Gunthorpe <jgg@xxxxxxxx>, Jens Axboe <axboe@xxxxxxxxx>, Johan Hedberg <johan.hedberg@xxxxxxxxx>, Johannes Berg <johannes.berg@xxxxxxxxx>, John Keeping <john@xxxxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Kalle Valo <kvalo@xxxxxxxxxx>, Keith Packard <keithp@xxxxxxxxxx>, keyrings@xxxxxxxxxxxxxxx, kunit-dev@xxxxxxxxxxxxxxxx, Kuniyuki Iwashima <kuniyu@xxxxxxxxxxxx>, "K. Y. Srinivasan" <kys@xxxxxxxxxxxxx>, Lars-Peter Clausen <lars@xxxxxxxxxx>, Lee Jones <lee.jones@xxxxxxxxxx>, Leon Romanovsky <leon@xxxxxxxxxx>, Liam Girdwood <lgirdwood@xxxxxxxxx>, linux1394-devel@xxxxxxxxxxxxxxxxxxxxx, linux-afs@xxxxxxxxxxxxxxxxxxx, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, linux-arm-msm@xxxxxxxxxxxxxxx, linux-bluetooth@xxxxxxxxxxxxxxx, linux-hardening@xxxxxxxxxxxxxxx, linux-hyperv@xxxxxxxxxxxxxxx, linux-integrity@xxxxxxxxxxxxxxx, linux-rdma@xxxxxxxxxxxxxxx, linux-scsi@xxxxxxxxxxxxxxx, linux-security-module@xxxxxxxxxxxxxxx, linux-usb@xxxxxxxxxxxxxxx, linux-xtensa@xxxxxxxxxxxxxxxx, llvm@xxxxxxxxxxxxxxx, Loic Poulain <loic.poulain@xxxxxxxxxx>, Louis Peens <louis.peens@xxxxxxxxxxxx>, Luca Coelho <luciano.coelho@xxxxxxxxx>, Luiz Augusto von Dentz <luiz.dentz@xxxxxxxxx>, Marc Dionne <marc.dionne@xxxxxxxxxxxx>, Marcel Holtmann <marcel@xxxxxxxxxxxx>, Mark Brown <broonie@xxxxxxxxxx>, "Martin K. Petersen" <martin.petersen@xxxxxxxxxx>, Max Filippov <jcmvbkbc@xxxxxxxxx>, Mimi Zohar <zohar@xxxxxxxxxxxxx>, Muchun Song <songmuchun@xxxxxxxxxxxxx>, Nathan Chancellor <nathan@xxxxxxxxxx>, Nick Desaulniers <ndesaulniers@xxxxxxxxxx>, Nuno Sá <nuno.sa@xxxxxxxxxx>, Paul Moore <paul@xxxxxxxxxxxxxx>, Rich Felker <dalias@xxxxxxxxxx>, Rob Herring <robh+dt@xxxxxxxxxx>, Russell King <linux@xxxxxxxxxxxxxxx>, selinux@xxxxxxxxxxxxxxx, "Serge E. Hallyn" <serge@xxxxxxxxxx>, SHA-cyfmac-dev-list@xxxxxxxxxxxx, Simon Horman <simon.horman@xxxxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Stefan Richter <stefanr@xxxxxxxxxxxxxxxxx>, Steffen Klassert <steffen.klassert@xxxxxxxxxxx>, Stephen Hemminger <sthemmin@xxxxxxxxxxxxx>, Stephen Smalley <stephen.smalley.work@xxxxxxxxx>, Tadeusz Struk <tadeusz.struk@xxxxxxxxxx>, Takashi Iwai <tiwai@xxxxxxxx>, Tom Rix <trix@xxxxxxxxxx>, Udipto Goswami <quic_ugoswami@xxxxxxxxxxx>, Vincenzo Frascino <vincenzo.frascino@xxxxxxx>, wcn36xx@xxxxxxxxxxxxxxxxxxx, Wei Liu <wei.liu@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, Xiu Jianfeng <xiujianfeng@xxxxxxxxxx>, Yang Yingliang <yangyingliang@xxxxxxxxxx>
- Delivery-date: Wed, 04 May 2022 05:16:22 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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@xxxxxxxxxxxxxxxx>
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Cc: Jakub Kicinski <kuba@xxxxxxxxxx>
Cc: Paolo Abeni <pabeni@xxxxxxxxxx>
Cc: linux-wireless@xxxxxxxxxxxxxxx
Cc: netdev@xxxxxxxxxxxxxxx
Cc: Eric Dumazet <edumazet@xxxxxxxxxx>
Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
---
net/wireless/core.h | 4 ++--
net/wireless/nl80211.c | 15 ++++-----------
2 files changed, 6 insertions(+), 13 deletions(-)
diff --git a/net/wireless/core.h b/net/wireless/core.h
index 3a7dbd63d8c6..899d111993c6 100644
--- a/net/wireless/core.h
+++ b/net/wireless/core.h
@@ -295,8 +295,8 @@ struct cfg80211_beacon_registration {
struct cfg80211_cqm_config {
u32 rssi_hyst;
s32 last_rssi_event_value;
- int n_rssi_thresholds;
- s32 rssi_thresholds[];
+ DECLARE_FLEX_ARRAY_ELEMENTS_COUNT(int, n_rssi_thresholds);
+ DECLARE_FLEX_ARRAY_ELEMENTS(s32, rssi_thresholds);
};
void cfg80211_destroy_ifaces(struct cfg80211_registered_device *rdev);
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 945ed87d12e0..70df7132cce8 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -12096,21 +12096,14 @@ static int nl80211_set_cqm_rssi(struct genl_info
*info,
wdev_lock(wdev);
if (n_thresholds) {
- struct cfg80211_cqm_config *cqm_config;
+ struct cfg80211_cqm_config *cqm_config = NULL;
- cqm_config = kzalloc(struct_size(cqm_config, rssi_thresholds,
- n_thresholds),
- GFP_KERNEL);
- if (!cqm_config) {
- err = -ENOMEM;
+ err = mem_to_flex_dup(&cqm_config, thresholds, n_thresholds,
+ GFP_KERNEL);
+ if (err)
goto unlock;
- }
cqm_config->rssi_hyst = hysteresis;
- cqm_config->n_rssi_thresholds = n_thresholds;
- memcpy(cqm_config->rssi_thresholds, thresholds,
- flex_array_size(cqm_config, rssi_thresholds,
- n_thresholds));
wdev->cqm_config = cqm_config;
}
--
2.32.0
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