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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id y5sm3790937pfa.5.2021.08.17.20.40.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 17 Aug 2021 20:40:47 -0700 (PDT) From: Kees Cook To: Wolfgang Grandegger Cc: Kees Cook , Marc Kleine-Budde , "David S. Miller" , Jakub Kicinski , Arunachalam Santhanam , Vincent Mailhol , linux-can@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org Subject: [PATCH] can: etas_es58x: Replace 0-element raw_msg array Date: Tue, 17 Aug 2021 20:40:10 -0700 Message-Id: <20210818034010.800652-1-keescook@chromium.org> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2405; h=from:subject; bh=2pghWRFPuQ+zVAOzO5gfNiPmiJDuiTH+Yfm+Ryq/M0I=; b=owEBbAKT/ZANAwAKAYly9N/cbcAmAcsmYgBhHIEaiZ+lXRC4QwUOqC71mOhS6HSGOj3Caw1KKYLF 7L2JZyaJAjIEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYRyBGgAKCRCJcvTf3G3AJsVpD/ j7xXbwKjJwKT2/GO+ODaujdBGdL6Osu0WV1eU4XmqS5JfJkc+l2PFtKNfj6weSU0gXlOjRX8zQo9Vk RGTXtjXdt7Cw6atuK6aFxzGJuFRek6LadYkYs7hUunrsAuHTyoV++Q/ltnSzptbX6zTZtKkzjT4Mnb 1sbL6mA+MGtTnYFO6cqc5IPv9qZZFZr7lOyYkpiztuUQjj1Lb8Zqj+/IP6sh7ePDPksNRFqHcIeEx4 u+cDgj0hCPPHdE4WRYbK2CSXjL5m9stprftBB5AfmdxXblnZIPW9w26iSWTVSKoyej3pB/f1upjQxs YUs4j6qklJb8pe1DGwrudFdZtGtFImGSL7ap+9UXyYhkU2txwLCOMZbwHhrSKTGw7C2c/GLTO+rceS qa/qXMGgpT1cMAkKX2yL1XK/wg4yCEbT00q4oj7XPLEcadol2gXH3dafW+/ydbcaY4kgxvYvBSewsP rXPTtLeoN4RpHB+kHdSXET3oed3KzRg6hS2x1078wD2iCE/RKQtbEyGHXPlpq8HOkHjCazT9CMbR9L cpAmLTqZeddlhGnvs0rlgQ8LxHHeEPEPCzyK+2blJZjg7aYahRjZlUm05YoPSQUN0XhInmO7oJIutG lbwOtuCNS2QSeh6mvvNab0mm/3Ibe3VZ8Kq/+P1m+l1sisDz595D+GbIOg X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-can@vger.kernel.org While raw_msg isn't a fixed size, it does have a maximum size. Adjust the struct to represent this and avoid the following warning when building with -Wzero-length-bounds: drivers/net/can/usb/etas_es58x/es58x_fd.c: In function 'es58x_fd_tx_can_msg': drivers/net/can/usb/etas_es58x/es58x_fd.c:360:35: warning: array subscript 65535 is outside the bounds of an interior zero-length array 'u8[0]' {aka 'unsigned char[]'} [-Wzero-length-bounds] 360 | tx_can_msg = (typeof(tx_can_msg))&es58x_fd_urb_cmd->raw_msg[msg_len]; | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ In file included from drivers/net/can/usb/etas_es58x/es58x_core.h:22, from drivers/net/can/usb/etas_es58x/es58x_fd.c:17: drivers/net/can/usb/etas_es58x/es58x_fd.h:231:6: note: while referencing 'raw_msg' 231 | u8 raw_msg[0]; | ^~~~~~~ Cc: Wolfgang Grandegger Cc: Marc Kleine-Budde Cc: "David S. Miller" Cc: Jakub Kicinski Cc: Arunachalam Santhanam Cc: Vincent Mailhol Cc: linux-can@vger.kernel.org Cc: netdev@vger.kernel.org Signed-off-by: Kees Cook --- drivers/net/can/usb/etas_es58x/es581_4.h | 2 +- drivers/net/can/usb/etas_es58x/es58x_fd.h | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/net/can/usb/etas_es58x/es581_4.h b/drivers/net/can/usb/etas_es58x/es581_4.h index 4bc60a6df697..af38c4938859 100644 --- a/drivers/net/can/usb/etas_es58x/es581_4.h +++ b/drivers/net/can/usb/etas_es58x/es581_4.h @@ -192,7 +192,7 @@ struct es581_4_urb_cmd { struct es581_4_rx_cmd_ret rx_cmd_ret; __le64 timestamp; u8 rx_cmd_ret_u8; - u8 raw_msg[0]; + u8 raw_msg[USHRT_MAX]; } __packed; __le16 reserved_for_crc16_do_not_use; diff --git a/drivers/net/can/usb/etas_es58x/es58x_fd.h b/drivers/net/can/usb/etas_es58x/es58x_fd.h index ee18a87e40c0..e0319b8358ef 100644 --- a/drivers/net/can/usb/etas_es58x/es58x_fd.h +++ b/drivers/net/can/usb/etas_es58x/es58x_fd.h @@ -228,7 +228,7 @@ struct es58x_fd_urb_cmd { struct es58x_fd_tx_ack_msg tx_ack_msg; __le64 timestamp; __le32 rx_cmd_ret_le32; - u8 raw_msg[0]; + u8 raw_msg[USHRT_MAX]; } __packed; __le16 reserved_for_crc16_do_not_use; -- 2.30.2