Messages in this thread | | | Date | Sat, 31 Oct 2020 13:49:17 +0800 | From | kernel test robot <> | Subject | kernel/trace/bpf_trace.c:1181:23: warning: Uninitialized variable: t |
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tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 5fc6b075e165f641fbc366b58b578055762d5f8c commit: c4d0bfb45068d853a478b9067a95969b1886a30f bpf: Add bpf_snprintf_btf helper date: 5 weeks ago compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@intel.com>
"cppcheck warnings: (new ones prefixed by >>)" >> kernel/trace/bpf_trace.c:1181:23: warning: Uninitialized variable: t [uninitvar] if (*btf_id <= 0 || !t) ^
vim +1181 kernel/trace/bpf_trace.c
1153 1154 #define BTF_F_ALL (BTF_F_COMPACT | BTF_F_NONAME | \ 1155 BTF_F_PTR_RAW | BTF_F_ZERO) 1156 1157 static int bpf_btf_printf_prepare(struct btf_ptr *ptr, u32 btf_ptr_size, 1158 u64 flags, const struct btf **btf, 1159 s32 *btf_id) 1160 { 1161 const struct btf_type *t; 1162 1163 if (unlikely(flags & ~(BTF_F_ALL))) 1164 return -EINVAL; 1165 1166 if (btf_ptr_size != sizeof(struct btf_ptr)) 1167 return -EINVAL; 1168 1169 *btf = bpf_get_btf_vmlinux(); 1170 1171 if (IS_ERR_OR_NULL(*btf)) 1172 return PTR_ERR(*btf); 1173 1174 if (ptr->type_id > 0) 1175 *btf_id = ptr->type_id; 1176 else 1177 return -EINVAL; 1178 1179 if (*btf_id > 0) 1180 t = btf_type_by_id(*btf, *btf_id); > 1181 if (*btf_id <= 0 || !t) 1182 return -ENOENT; 1183 1184 return 0; 1185 } 1186
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