tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: b0523c7b1c9d0edcd6c0fe6d2cb558a9ad5c60a8 commit: 4c559f15efcc43b996f4da528cd7f9483aaca36d [11986/12912] netfilter: nf_conntrack_pptp: prevent buffer overflows in debug code config: x86_64-allyesconfig (attached as .config) compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 3393cc4cebf9969db94dc424b7a2b6195589c33b) 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 # install x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu git checkout 4c559f15efcc43b996f4da528cd7f9483aaca36d # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>, old ones prefixed by <<): In file included from net/openvswitch/conntrack.c:25: In file included from include/net/netfilter/nf_nat.h:7: extern const char *const pptp_msg_name(u_int16_t msg); ^~~~~~ 1 warning generated. -- In file included from net/ipv4/netfilter/nf_nat_h323.c:16: In file included from include/net/netfilter/nf_nat.h:7: extern const char *const pptp_msg_name(u_int16_t msg); ^~~~~~ net/ipv4/netfilter/nf_nat_h323.c:160:16: warning: format specifies type 'unsigned short' but the argument has type 'int' [-Wformat] &addr.ip, ntohs(port), ^~~~~~~~~~~ include/linux/printk.h:330:26: note: expanded from macro 'pr_debug' dynamic_pr_debug(fmt, ##__VA_ARGS__) ~~~ ^~~~~~~~~~~ include/linux/dynamic_debug.h:154:22: note: expanded from macro 'dynamic_pr_debug' pr_fmt(fmt), ##__VA_ARGS__) ~~~ ^~~~~~~~~~~ include/linux/dynamic_debug.h:143:56: note: expanded from macro '_dynamic_func_call' __dynamic_func_call(__UNIQUE_ID(ddebug), fmt, func, ##__VA_ARGS__) ^~~~~~~~~~~ note: (skipping 2 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all) include/linux/byteorder/generic.h:137:21: note: expanded from macro '___ntohs' #define ___ntohs(x) __be16_to_cpu(x) ^~~~~~~~~~~~~~~~ include/uapi/linux/byteorder/little_endian.h:42:26: note: expanded from macro '__be16_to_cpu' #define __be16_to_cpu(x) __swab16((__force __u16)(__be16)(x)) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/uapi/linux/swab.h:105:2: note: expanded from macro '__swab16' (__builtin_constant_p((__u16)(x)) ? ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ net/ipv4/netfilter/nf_nat_h323.c:162:6: warning: format specifies type 'unsigned short' but the argument has type 'int' [-Wformat] ntohs(ct->tuplehash[!dir].tuple.dst.u.udp.port)); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/printk.h:330:26: note: expanded from macro 'pr_debug' dynamic_pr_debug(fmt, ##__VA_ARGS__) ~~~ ^~~~~~~~~~~ include/linux/dynamic_debug.h:154:22: note: expanded from macro 'dynamic_pr_debug' pr_fmt(fmt), ##__VA_ARGS__) ~~~ ^~~~~~~~~~~ include/linux/dynamic_debug.h:143:56: note: expanded from macro '_dynamic_func_call' __dynamic_func_call(__UNIQUE_ID(ddebug), fmt, func, ##__VA_ARGS__) ^~~~~~~~~~~ note: (skipping 2 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all) include/linux/byteorder/generic.h:137:21: note: expanded from macro '___ntohs' #define ___ntohs(x) __be16_to_cpu(x) ^~~~~~~~~~~~~~~~ include/uapi/linux/byteorder/little_endian.h:42:26: note: expanded from macro '__be16_to_cpu' #define __be16_to_cpu(x) __swab16((__force __u16)(__be16)(x)) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/uapi/linux/swab.h:105:2: note: expanded from macro '__swab16' (__builtin_constant_p((__u16)(x)) ? ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ net/ipv4/netfilter/nf_nat_h323.c:267:4: warning: format specifies type 'unsigned short' but the argument has type 'int' [-Wformat] ntohs(rtp_exp->tuple.src.u.udp.port), ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/printk.h:330:26: note: expanded from macro 'pr_debug' dynamic_pr_debug(fmt, ##__VA_ARGS__) ~~~ ^~~~~~~~~~~ include/linux/dynamic_debug.h:154:22: note: expanded from macro 'dynamic_pr_debug' pr_fmt(fmt), ##__VA_ARGS__) ~~~ ^~~~~~~~~~~ include/linux/dynamic_debug.h:143:56: note: expanded from macro '_dynamic_func_call' __dynamic_func_call(__UNIQUE_ID(ddebug), fmt, func, ##__VA_ARGS__) ^~~~~~~~~~~ note: (skipping 2 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all) include/linux/byteorder/generic.h:137:21: note: expanded from macro '___ntohs' #define ___ntohs(x) __be16_to_cpu(x) ^~~~~~~~~~~~~~~~ include/uapi/linux/byteorder/little_endian.h:42:26: note: expanded from macro '__be16_to_cpu' #define __be16_to_cpu(x) __swab16((__force __u16)(__be16)(x)) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/uapi/linux/swab.h:105:2: note: expanded from macro '__swab16' (__builtin_constant_p((__u16)(x)) ? ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ net/ipv4/netfilter/nf_nat_h323.c:269:4: warning: format specifies type 'unsigned short' but the argument has type 'int' [-Wformat] ntohs(rtp_exp->tuple.dst.u.udp.port)); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/printk.h:330:26: note: expanded from macro 'pr_debug' dynamic_pr_debug(fmt, ##__VA_ARGS__) ~~~ ^~~~~~~~~~~ include/linux/dynamic_debug.h:154:22: note: expanded from macro 'dynamic_pr_debug' pr_fmt(fmt), ##__VA_ARGS__) ~~~ ^~~~~~~~~~~ include/linux/dynamic_debug.h:143:56: note: expanded from macro '_dynamic_func_call' __dynamic_func_call(__UNIQUE_ID(ddebug), fmt, func, ##__VA_ARGS__) ^~~~~~~~~~~ note: (skipping 2 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all) include/linux/byteorder/generic.h:137:21: note: expanded from macro '___ntohs' #define ___ntohs(x) __be16_to_cpu(x) ^~~~~~~~~~~~~~~~ include/uapi/linux/byteorder/little_endian.h:42:26: note: expanded from macro '__be16_to_cpu' #define __be16_to_cpu(x) __swab16((__force __u16)(__be16)(x)) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/uapi/linux/swab.h:105:2: note: expanded from macro '__swab16' (__builtin_constant_p((__u16)(x)) ? ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ net/ipv4/netfilter/nf_nat_h323.c:272:4: warning: format specifies type 'unsigned short' but the argument has type 'int' [-Wformat] ntohs(rtcp_exp->tuple.src.u.udp.port), ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/printk.h:330:26: note: expanded from macro 'pr_debug' dynamic_pr_debug(fmt, ##__VA_ARGS__) ~~~ ^~~~~~~~~~~ include/linux/dynamic_debug.h:154:22: note: expanded from macro 'dynamic_pr_debug' pr_fmt(fmt), ##__VA_ARGS__) ~~~ ^~~~~~~~~~~ include/linux/dynamic_debug.h:143:56: note: expanded from macro '_dynamic_func_call' -- In file included from net/ipv4/netfilter/nf_nat_snmp_basic_main.c:43: In file included from include/net/netfilter/nf_nat.h:7: extern const char *const pptp_msg_name(u_int16_t msg); ^~~~~~ net/ipv4/netfilter/nf_nat_snmp_basic_main.c:47:10: fatal error: 'nf_nat_snmp_basic.asn1.h' file not found #include "nf_nat_snmp_basic.asn1.h" ^~~~~~~~~~~~~~~~~~~~~~~~~~ 1 warning and 1 error generated. -- In file included from net/netfilter/nf_conntrack_pptp.c:36: extern const char *const pptp_msg_name(u_int16_t msg); ^~~~~~ const char *const pptp_msg_name(u_int16_t msg) ^~~~~~ 2 warnings generated. vim +/const +13 include/linux/netfilter/nf_conntrack_pptp.h 12 14 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org