:::::: :::::: Manual check reason: "low confidence bisect report" :::::: Manual check reason: "low confidence static check warning: drivers/net/can/spi/mcp251xfd/mcp251xfd-ring.c:26:16: warning: use of uninitialized value '<unknown>' [CWE-457] [-Wanalyzer-use-of-uninitialized-value]" ::::::
BCC: [email protected] CC: [email protected] CC: [email protected] TO: "Marc Kleine-Budde" <[email protected]> tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: a335366bad1364a07f49df9da1fdfa6d411a5f39 commit: 55bc37c85587d0c53a666a685a49752e28a31396 can: mcp251xfd: move ring init into separate function date: 8 months ago :::::: branch date: 10 hours ago :::::: commit date: 8 months ago config: arm-randconfig-c002-20220915 (https://download.01.org/0day-ci/archive/20220917/[email protected]/config) compiler: arm-linux-gnueabi-gcc (GCC) 12.1.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=55bc37c85587d0c53a666a685a49752e28a31396 git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 55bc37c85587d0c53a666a685a49752e28a31396 # save the config file COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross ARCH=arm KBUILD_USERCFLAGS='-fanalyzer -Wno-error' If you fix the issue, kindly add following tag where applicable Reported-by: kernel test robot <[email protected]> gcc_analyzer warnings: (new ones prefixed by >>) drivers/net/can/spi/mcp251xfd/mcp251xfd-ring.c: In function 'mcp251xfd_cmd_prepare_write_reg': >> drivers/net/can/spi/mcp251xfd/mcp251xfd-ring.c:26:16: warning: use of >> uninitialized value '<unknown>' [CWE-457] >> [-Wanalyzer-use-of-uninitialized-value] 26 | __le32 val_le32; | ^~~~~~~~ 'mcp251xfd_cmd_prepare_write_reg': event 1 | | 26 | __le32 val_le32; | | ^~~~~~~~ | | | | | (1) use of uninitialized value '<unknown>' here | vim +26 drivers/net/can/spi/mcp251xfd/mcp251xfd-ring.c 55bc37c85587d0 Marc Kleine-Budde 2021-05-21 18 55bc37c85587d0 Marc Kleine-Budde 2021-05-21 19 static inline u8 55bc37c85587d0 Marc Kleine-Budde 2021-05-21 20 mcp251xfd_cmd_prepare_write_reg(const struct mcp251xfd_priv *priv, 55bc37c85587d0 Marc Kleine-Budde 2021-05-21 21 union mcp251xfd_write_reg_buf *write_reg_buf, 55bc37c85587d0 Marc Kleine-Budde 2021-05-21 22 const u16 reg, const u32 mask, const u32 val) 55bc37c85587d0 Marc Kleine-Budde 2021-05-21 23 { 55bc37c85587d0 Marc Kleine-Budde 2021-05-21 24 u8 first_byte, last_byte, len; 55bc37c85587d0 Marc Kleine-Budde 2021-05-21 25 u8 *data; 55bc37c85587d0 Marc Kleine-Budde 2021-05-21 @26 __le32 val_le32; 55bc37c85587d0 Marc Kleine-Budde 2021-05-21 27 55bc37c85587d0 Marc Kleine-Budde 2021-05-21 28 first_byte = mcp251xfd_first_byte_set(mask); 55bc37c85587d0 Marc Kleine-Budde 2021-05-21 29 last_byte = mcp251xfd_last_byte_set(mask); 55bc37c85587d0 Marc Kleine-Budde 2021-05-21 30 len = last_byte - first_byte + 1; 55bc37c85587d0 Marc Kleine-Budde 2021-05-21 31 55bc37c85587d0 Marc Kleine-Budde 2021-05-21 32 data = mcp251xfd_spi_cmd_write(priv, write_reg_buf, reg + first_byte); 55bc37c85587d0 Marc Kleine-Budde 2021-05-21 33 val_le32 = cpu_to_le32(val >> BITS_PER_BYTE * first_byte); 55bc37c85587d0 Marc Kleine-Budde 2021-05-21 34 memcpy(data, &val_le32, len); 55bc37c85587d0 Marc Kleine-Budde 2021-05-21 35 55bc37c85587d0 Marc Kleine-Budde 2021-05-21 36 if (priv->devtype_data.quirks & MCP251XFD_QUIRK_CRC_REG) { 55bc37c85587d0 Marc Kleine-Budde 2021-05-21 37 u16 crc; 55bc37c85587d0 Marc Kleine-Budde 2021-05-21 38 55bc37c85587d0 Marc Kleine-Budde 2021-05-21 39 mcp251xfd_spi_cmd_crc_set_len_in_reg(&write_reg_buf->crc.cmd, 55bc37c85587d0 Marc Kleine-Budde 2021-05-21 40 len); 55bc37c85587d0 Marc Kleine-Budde 2021-05-21 41 /* CRC */ 55bc37c85587d0 Marc Kleine-Budde 2021-05-21 42 len += sizeof(write_reg_buf->crc.cmd); 55bc37c85587d0 Marc Kleine-Budde 2021-05-21 43 crc = mcp251xfd_crc16_compute(&write_reg_buf->crc, len); 55bc37c85587d0 Marc Kleine-Budde 2021-05-21 44 put_unaligned_be16(crc, (void *)write_reg_buf + len); 55bc37c85587d0 Marc Kleine-Budde 2021-05-21 45 55bc37c85587d0 Marc Kleine-Budde 2021-05-21 46 /* Total length */ 55bc37c85587d0 Marc Kleine-Budde 2021-05-21 47 len += sizeof(write_reg_buf->crc.crc); 55bc37c85587d0 Marc Kleine-Budde 2021-05-21 48 } else { 55bc37c85587d0 Marc Kleine-Budde 2021-05-21 49 len += sizeof(write_reg_buf->nocrc.cmd); 55bc37c85587d0 Marc Kleine-Budde 2021-05-21 50 } 55bc37c85587d0 Marc Kleine-Budde 2021-05-21 51 55bc37c85587d0 Marc Kleine-Budde 2021-05-21 52 return len; 55bc37c85587d0 Marc Kleine-Budde 2021-05-21 53 } 55bc37c85587d0 Marc Kleine-Budde 2021-05-21 54 -- 0-DAY CI Kernel Test Service https://01.org/lkp _______________________________________________ kbuild mailing list -- [email protected] To unsubscribe send an email to [email protected]
