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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id p6-20020a170902780600b0015e8d4eb1cesm6917631pll.24.2022.05.03.18.52.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 03 May 2022 18:52:45 -0700 (PDT) From: Kees Cook To: "Gustavo A . R . Silva" Cc: Kees Cook , Christian Lamparter , Kalle Valo , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , linux-wireless@vger.kernel.org, netdev@vger.kernel.org, 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?= , 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 , Johannes Berg , John Keeping , Juergen Gross , 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 09/32] p54: Use mem_to_flex_dup() with struct p54_cal_database Date: Tue, 3 May 2022 18:44:18 -0700 Message-Id: <20220504014440.3697851-10-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=2429; h=from:subject; bh=nMnYI58OZL/NYqqBGThX6X9At9N55AKclw2PdmxLkv8=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBicdqCpEYc7sUWDpluF0bUB90CkVbrB3/z8O0fymGg eduju0uJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYnHaggAKCRCJcvTf3G3AJkJoEA CB3d+CRBr1VkScrlHfbIs1LkNyymQ0HwJgl7p4QyueseREG9Mt5326Iwc7RqKF+Rn+YzyWk8dFShzv z6gbI8PNrGAqBPz5BIqLg3dYYHVK5dPPYcYrISNYxFwyXlYH5CnwM8gllN72k9RJxbWzAxh0A+60N/ jviJWlHykiM1Zhxd/qazs6ZevTYO060Zif3DN8WCX/LuwNHp30u5sclQ55oDW3betiobkSC6Ov1eP6 Hi7uDPuaVPlM2ZtdStVUbJUtmb0ddMSgxtTLjFPmzu+/igOg0pwYTovc41hbeEbBnxlRHIoUJWYLEF 9HwXpVeVj29IIka07Wj1DhYds+eo/zSM1UgogveTLy1YqauYGa0HDWQq9oUmlyE1DVBtfNlwDKfQFw abW5WTkLqlaK1bDWZEM/2f5rXJ6Qb2wLF8985KU4MwKaSdM+Jib4Npl3mdvg3RTIqLUDL5C0EsnPZd jx7VWu4NuZxHBeVOpG042kcl9h6NgrzPV4i2lneNTdK9Mf4aIUBuhXuEi0RjjZPRX5KWBWDETa+SHA xIpk2sXTFarSyRcDwvPPRN7FWxxM5y5OPAGRGPRQhj9zCDB+Eh+NAEZe1GFUTZYOWu4PHtyiVVuH0q lf+bEbHqDfX8rt+XVzeUsKcH3bW7KZvEkMLgB/C70MIwPtiUdXvWDMDbvCRw== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Precedence: bulk List-ID: X-Mailing-List: linux-hardening@vger.kernel.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: Christian Lamparter Cc: Kalle Valo Cc: "David S. Miller" Cc: Eric Dumazet Cc: Jakub Kicinski Cc: Paolo Abeni Cc: linux-wireless@vger.kernel.org Cc: netdev@vger.kernel.org Signed-off-by: Kees Cook --- 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