Hi Andy, url: https://github.com/0day-ci/linux/commits/Andy-Shevchenko/serial-8250_pci-... base: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty.git tty-testing config: x86_64-randconfig-m001-20210713 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; Reported-by: Dan Carpenter <dan.carpenter(a)oracle.com&gt; smatch warnings: drivers/tty/serial/8250/8250_pci.c:927 pci_ite887x_init() error: buffer overflow 'inta_addr' 7 <= 7 (assuming for loop doesn't break) vim +927 drivers/tty/serial/8250/8250_pci.c 97f2398f0f6a89 drivers/tty/serial/8250/8250_pci.c Andy Shevchenko 2021-07-13 901 static const short inta_addr[] = { 0x2a0, 0x2c0, 0x220, 0x240, 0x1e0, 0x200, 0x280, }; f79abb828e1d85 drivers/serial/8250_pci.c Ralf Baechle 2007-08-30 902 static int pci_ite887x_init(struct pci_dev *dev) 84f8c6fc0e3b6e drivers/serial/8250_pci.c Niels de Vos 2007-08-22 903 { 84f8c6fc0e3b6e drivers/serial/8250_pci.c Niels de Vos 2007-08-22 904 int ret, i, type; 84f8c6fc0e3b6e drivers/serial/8250_pci.c Niels de Vos 2007-08-22 905 struct resource *iobase = NULL; 84f8c6fc0e3b6e drivers/serial/8250_pci.c Niels de Vos 2007-08-22 906 u32 miscr, uartbar, ioport; 84f8c6fc0e3b6e drivers/serial/8250_pci.c Niels de Vos 2007-08-22 907 84f8c6fc0e3b6e drivers/serial/8250_pci.c Niels de Vos 2007-08-22 908 /* search for the base-ioport */ 97f2398f0f6a89 drivers/tty/serial/8250/8250_pci.c Andy Shevchenko 2021-07-13 909 for (i = 0; i < ARRAY_SIZE(inta_addr); i++) { ^^^^^^^^^^^^^^^^^^^^^^^^^ 97f2398f0f6a89 drivers/tty/serial/8250/8250_pci.c Andy Shevchenko 2021-07-13 910 iobase = request_region(inta_addr[i], ITE_887x_IOSIZE, "ite887x"); 84f8c6fc0e3b6e drivers/serial/8250_pci.c Niels de Vos 2007-08-22 911 if (iobase != NULL) { 84f8c6fc0e3b6e drivers/serial/8250_pci.c Niels de Vos 2007-08-22 912 /* write POSIO0R - speed | size | ioport */ 84f8c6fc0e3b6e drivers/serial/8250_pci.c Niels de Vos 2007-08-22 913 pci_write_config_dword(dev, ITE_887x_POSIO0, 84f8c6fc0e3b6e drivers/serial/8250_pci.c Niels de Vos 2007-08-22 914 ITE_887x_POSIO_ENABLE | ITE_887x_POSIO_SPEED | 84f8c6fc0e3b6e drivers/serial/8250_pci.c Niels de Vos 2007-08-22 915 ITE_887x_POSIO_IOSIZE_32 | inta_addr[i]); 84f8c6fc0e3b6e drivers/serial/8250_pci.c Niels de Vos 2007-08-22 916 /* write INTCBAR - ioport */ 97f2398f0f6a89 drivers/tty/serial/8250/8250_pci.c Andy Shevchenko 2021-07-13 917 pci_write_config_dword(dev, ITE_887x_INTCBAR, inta_addr[i]); 84f8c6fc0e3b6e drivers/serial/8250_pci.c Niels de Vos 2007-08-22 918 ret = inb(inta_addr[i]); 84f8c6fc0e3b6e drivers/serial/8250_pci.c Niels de Vos 2007-08-22 919 if (ret != 0xff) { 84f8c6fc0e3b6e drivers/serial/8250_pci.c Niels de Vos 2007-08-22 920 /* ioport connected */ 84f8c6fc0e3b6e drivers/serial/8250_pci.c Niels de Vos 2007-08-22 921 break; 84f8c6fc0e3b6e drivers/serial/8250_pci.c Niels de Vos 2007-08-22 922 } 84f8c6fc0e3b6e drivers/serial/8250_pci.c Niels de Vos 2007-08-22 923 release_region(iobase->start, ITE_887x_IOSIZE); 84f8c6fc0e3b6e drivers/serial/8250_pci.c Niels de Vos 2007-08-22 924 } 84f8c6fc0e3b6e drivers/serial/8250_pci.c Niels de Vos 2007-08-22 925 } 84f8c6fc0e3b6e drivers/serial/8250_pci.c Niels de Vos 2007-08-22 926 84f8c6fc0e3b6e drivers/serial/8250_pci.c Niels de Vos 2007-08-22 @927 if (!inta_addr[i]) { Should this be changed to if (i == ARRAY_SIZE(inta_addr)) {? af8c5b8debb046 drivers/tty/serial/8250/8250_pci.c Greg Kroah-Hartman 2013-09-28 928 dev_err(&dev->dev, "ite887x: could not find iobase\n"); 84f8c6fc0e3b6e drivers/serial/8250_pci.c Niels de Vos 2007-08-22 929 return -ENODEV; 84f8c6fc0e3b6e drivers/serial/8250_pci.c Niels de Vos 2007-08-22 930 } 84f8c6fc0e3b6e drivers/serial/8250_pci.c Niels de Vos 2007-08-22 931 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org