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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id on13-20020a17090b1d0d00b001d9acbc3b4esm2003067pjb.47.2022.05.03.18.47.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 03 May 2022 18:47:39 -0700 (PDT) From: Kees Cook To: "Gustavo A . R . Silva" Cc: Kees Cook , Johannes Berg , "David S. Miller" , Jakub Kicinski , Paolo Abeni , linux-wireless@vger.kernel.org, netdev@vger.kernel.org, Eric Dumazet , Alexei Starovoitov , alsa-devel@alsa-project.org, Al Viro , Andrew Gabbasov , Andrew Morton , Andy Gross , Andy Lavr , Arend van Spriel , Baowen Zheng , Bjorn Andersson , Boris Ostrovsky , Bradley Grove , brcm80211-dev-list.pdl@broadcom.com, Christian Brauner , =?utf-8?q?Christian_G=C3=B6ttsche?= , Christian Lamparter , Chris Zankel , Cong Wang , Daniel Axtens , Daniel Vetter , Dan Williams , David Gow , David Howells , Dennis Dalessandro , devicetree@vger.kernel.org, Dexuan Cui , Dmitry Kasatkin , Eli Cohen , Eric Paris , Eugeniu Rosca , Felipe Balbi , Francis Laniel , Frank Rowand , Franky Lin , Greg Kroah-Hartman , Gregory Greenman , Guenter Roeck , Haiyang Zhang , Hante Meuleman , Herbert Xu , Hulk Robot , "James E.J. Bottomley" , James Morris , Jarkko Sakkinen , Jaroslav Kysela , Jason Gunthorpe , Jens Axboe , Johan Hedberg , Johannes Berg , John Keeping , Juergen Gross , Kalle Valo , Keith Packard , keyrings@vger.kernel.org, kunit-dev@googlegroups.com, Kuniyuki Iwashima , "K. Y. Srinivasan" , Lars-Peter Clausen , Lee Jones , Leon Romanovsky , Liam Girdwood , linux1394-devel@lists.sourceforge.net, linux-afs@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, linux-bluetooth@vger.kernel.org, linux-hardening@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-integrity@vger.kernel.org, linux-rdma@vger.kernel.org, linux-scsi@vger.kernel.org, linux-security-module@vger.kernel.org, linux-usb@vger.kernel.org, linux-xtensa@linux-xtensa.org, llvm@lists.linux.dev, Loic Poulain , Louis Peens , Luca Coelho , Luiz Augusto von Dentz , Marc Dionne , Marcel Holtmann , Mark Brown , "Martin K. Petersen" , Max Filippov , Mimi Zohar , Muchun Song , Nathan Chancellor , Nick Desaulniers , =?utf-8?q?Nuno_S=C3=A1?= , Paul Moore , Rich Felker , Rob Herring , Russell King , selinux@vger.kernel.org, "Serge E. Hallyn" , SHA-cyfmac-dev-list@infineon.com, Simon Horman , Stefano Stabellini , Stefan Richter , Steffen Klassert , Stephen Hemminger , Stephen Smalley , Tadeusz Struk , Takashi Iwai , Tom Rix , Udipto Goswami , Vincenzo Frascino , wcn36xx@lists.infradead.org, Wei Liu , xen-devel@lists.xenproject.org, Xiu Jianfeng , Yang Yingliang Subject: [PATCH 11/32] nl80211: Use mem_to_flex_dup() with struct cfg80211_cqm_config Date: Tue, 3 May 2022 18:44:20 -0700 Message-Id: <20220504014440.3697851-12-keescook@chromium.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20220504014440.3697851-1-keescook@chromium.org> References: <20220504014440.3697851-1-keescook@chromium.org> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2217; h=from:subject; bh=rRfAu1/k1e5caQg21/8VBHhysNqsP1FR5GA2AHrLW6w=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBicdqDYqJpVuI+Da24TYyn7rK2cAZcih+2ZRWaGUhg VviQcPmJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYnHagwAKCRCJcvTf3G3AJjdwD/ 9GoZycFvhK6h6fbIQwuLO60vgqzr+JFBMz2boSXTBJSryctNsbZrwuvUuiBZUKC1y9sGE+SgzQm0T7 WzDZtyTlGmT1CZjKFpgdCfMbuMLVROkIwwyYoraeYFirZmIIRURYhLoAsJh4ZeL+hi8jOWnaV5ClMm GpAX4WW1YsM9YRJimQri0QE7pLQKGb80KxVsDgul4e0OUj1wYZTYbTgr98Zpysc1nSby6oGnxfPJ5B GvVh8QA/SYaCCMlYyUKr3bjTLrKOZ0NSnt6bAW38OpCXj8344D0TsfmO6tGo0jkheFbpEhSFjRi0Lj 1/+lxcBQ3jvc7zB+0Q5hpVWgX0kC+MxgbmIRdXF66gXOY9KMZzGl6dt9Fdm0xQWH6kFZlX7zpOBeHx To/pgX+EVE7aw6zudBInH3vlkkTYIklAIL/O9ajINZfL2HKHTp1XgnQdpa0KDyxqJilBhkXXekcKjn s7KJFzs28RJWqn+YgyJ+4W4uA6XLQvHdqVGZu5zS748KLU05KkgCeTW+Wm195aiMdUvqPG1QyqpCX5 1oMep8SXDkjOyDi6DnWcfFivJfrpKBqXU3oWsvXdBRhX+fVXmfr/E7qrARl1smC7xBgqWCcJf152Rh nwFocx9Hoo9dTUkHbkM4z/OFi36I6ENfaPOS+x9fFE1riA7xPsrh1gW6nwwA== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Precedence: bulk List-ID: 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 Cc: "David S. Miller" Cc: Jakub Kicinski Cc: Paolo Abeni Cc: linux-wireless@vger.kernel.org Cc: netdev@vger.kernel.org Cc: Eric Dumazet Signed-off-by: Kees Cook --- 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; }