:::::: :::::: Manual check reason: "low confidence bisect report" :::::: Manual check reason: "low confidence static check first_new_problem: drivers/isdn/hardware/mISDN/hfcsusb.c:1695:16: warning: use of uninitialized value '<unknown>' [CWE-457] [-Wanalyzer-use-of-uninitialized-value]" ::::::
BCC: l...@intel.com CC: kbuild-...@lists.01.org CC: linux-ker...@vger.kernel.org TO: Kees Cook <keesc...@chromium.org> tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: d895ec7938c431fe61a731939da76a6461bc6133 commit: f68f2ff91512c199ec24883001245912afc17873 fortify: Detect struct member overflows in memcpy() at compile-time date: 7 months ago :::::: branch date: 14 hours ago :::::: commit date: 7 months ago config: arm-randconfig-c002-20220830 (https://download.01.org/0day-ci/archive/20220903/202209032118.haav9ixb-...@intel.com/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=f68f2ff91512c199ec24883001245912afc17873 git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout f68f2ff91512c199ec24883001245912afc17873 # 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 <l...@intel.com> gcc_analyzer warnings: (new ones prefixed by >>) drivers/isdn/hardware/mISDN/hfcsusb.c: In function 'setup_hfcsusb': >> drivers/isdn/hardware/mISDN/hfcsusb.c:1695:16: warning: use of uninitialized >> value '<unknown>' [CWE-457] [-Wanalyzer-use-of-uninitialized-value] 1695 | u_char b; | ^ 'setup_hfcsusb': event 1 | | 1695 | u_char b; | | ^ | | | | | (1) use of uninitialized value '<unknown>' here | vim +1695 drivers/isdn/hardware/mISDN/hfcsusb.c 69f52adb2d534a Karsten Keil 2009-01-09 1688 69f52adb2d534a Karsten Keil 2009-01-09 1689 69f52adb2d534a Karsten Keil 2009-01-09 1690 /* Hardware Initialization */ 6c2959aa7b81b8 Hannes Eder 2009-02-12 1691 static int 69f52adb2d534a Karsten Keil 2009-01-09 1692 setup_hfcsusb(struct hfcsusb *hw) 69f52adb2d534a Karsten Keil 2009-01-09 1693 { d8a1de3d5bb881 Juliana Rodrigueiro 2019-07-31 1694 void *dmabuf = kmalloc(sizeof(u_char), GFP_KERNEL); 69f52adb2d534a Karsten Keil 2009-01-09 @1695 u_char b; d8a1de3d5bb881 Juliana Rodrigueiro 2019-07-31 1696 int ret; 69f52adb2d534a Karsten Keil 2009-01-09 1697 69f52adb2d534a Karsten Keil 2009-01-09 1698 if (debug & DBG_HFC_CALL_TRACE) 69f52adb2d534a Karsten Keil 2009-01-09 1699 printk(KERN_DEBUG "%s: %s\n", hw->name, __func__); 69f52adb2d534a Karsten Keil 2009-01-09 1700 d8a1de3d5bb881 Juliana Rodrigueiro 2019-07-31 1701 if (!dmabuf) d8a1de3d5bb881 Juliana Rodrigueiro 2019-07-31 1702 return -ENOMEM; d8a1de3d5bb881 Juliana Rodrigueiro 2019-07-31 1703 d8a1de3d5bb881 Juliana Rodrigueiro 2019-07-31 1704 ret = read_reg_atomic(hw, HFCUSB_CHIP_ID, dmabuf); d8a1de3d5bb881 Juliana Rodrigueiro 2019-07-31 1705 d8a1de3d5bb881 Juliana Rodrigueiro 2019-07-31 1706 memcpy(&b, dmabuf, sizeof(u_char)); d8a1de3d5bb881 Juliana Rodrigueiro 2019-07-31 1707 kfree(dmabuf); d8a1de3d5bb881 Juliana Rodrigueiro 2019-07-31 1708 69f52adb2d534a Karsten Keil 2009-01-09 1709 /* check the chip id */ d8a1de3d5bb881 Juliana Rodrigueiro 2019-07-31 1710 if (ret != 1) { 69f52adb2d534a Karsten Keil 2009-01-09 1711 printk(KERN_DEBUG "%s: %s: cannot read chip id\n", 69f52adb2d534a Karsten Keil 2009-01-09 1712 hw->name, __func__); 69f52adb2d534a Karsten Keil 2009-01-09 1713 return 1; 69f52adb2d534a Karsten Keil 2009-01-09 1714 } 69f52adb2d534a Karsten Keil 2009-01-09 1715 if (b != HFCUSB_CHIPID) { 69f52adb2d534a Karsten Keil 2009-01-09 1716 printk(KERN_DEBUG "%s: %s: Invalid chip id 0x%02x\n", 69f52adb2d534a Karsten Keil 2009-01-09 1717 hw->name, __func__, b); 69f52adb2d534a Karsten Keil 2009-01-09 1718 return 1; 69f52adb2d534a Karsten Keil 2009-01-09 1719 } 69f52adb2d534a Karsten Keil 2009-01-09 1720 69f52adb2d534a Karsten Keil 2009-01-09 1721 /* first set the needed config, interface and alternate */ 3c76c58fca03c1 David S. Miller 2011-04-17 1722 (void) usb_set_interface(hw->dev, hw->if_used, hw->alt_used); 69f52adb2d534a Karsten Keil 2009-01-09 1723 69f52adb2d534a Karsten Keil 2009-01-09 1724 hw->led_state = 0; 69f52adb2d534a Karsten Keil 2009-01-09 1725 69f52adb2d534a Karsten Keil 2009-01-09 1726 /* init the background machinery for control requests */ 69f52adb2d534a Karsten Keil 2009-01-09 1727 hw->ctrl_read.bRequestType = 0xc0; 69f52adb2d534a Karsten Keil 2009-01-09 1728 hw->ctrl_read.bRequest = 1; 69f52adb2d534a Karsten Keil 2009-01-09 1729 hw->ctrl_read.wLength = cpu_to_le16(1); 69f52adb2d534a Karsten Keil 2009-01-09 1730 hw->ctrl_write.bRequestType = 0x40; 69f52adb2d534a Karsten Keil 2009-01-09 1731 hw->ctrl_write.bRequest = 0; 69f52adb2d534a Karsten Keil 2009-01-09 1732 hw->ctrl_write.wLength = 0; 69f52adb2d534a Karsten Keil 2009-01-09 1733 usb_fill_control_urb(hw->ctrl_urb, hw->dev, hw->ctrl_out_pipe, 69f52adb2d534a Karsten Keil 2009-01-09 1734 (u_char *)&hw->ctrl_write, NULL, 0, 69f52adb2d534a Karsten Keil 2009-01-09 1735 (usb_complete_t)ctrl_complete, hw); 69f52adb2d534a Karsten Keil 2009-01-09 1736 69f52adb2d534a Karsten Keil 2009-01-09 1737 reset_hfcsusb(hw); 69f52adb2d534a Karsten Keil 2009-01-09 1738 return 0; 69f52adb2d534a Karsten Keil 2009-01-09 1739 } 69f52adb2d534a Karsten Keil 2009-01-09 1740 :::::: The code at line 1695 was first introduced by commit :::::: 69f52adb2d534afc41fcc658f155e01f0b322f9e mISDN: Add HFC USB driver :::::: TO: Karsten Keil <kk...@suse.de> :::::: CC: Karsten Keil <kk...@suse.de> -- 0-DAY CI Kernel Test Service https://01.org/lkp _______________________________________________ kbuild mailing list -- kbuild@lists.01.org To unsubscribe send an email to kbuild-le...@lists.01.org
