bpf: fix cbpf parser bug for octal numbers

Range is 0-7, not 0-9, otherwise parser silently excludes it from the
strtol() rather than throwing an error.

Reported-by: Marc Boschma <marc@boschma.cx>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

diff --git a/tools/bpf/bpf_exp.l b/tools/bpf/bpf_exp.l
index bd83149e7be04c3968f9e60d730aca4b1c40b331..4da8d053d68f58d1be2ba277aec3439a611bf110 100644 (file)
--- a/tools/bpf/bpf_exp.l
+++ b/tools/bpf/bpf_exp.l
@@ -175,7 +175,7 @@ extern void yyerror(const char *str);
                        yylval.number = strtol(yytext, NULL, 10);
                        return number;
                }
-([0][0-9]+)    {
+([0][0-7]+)    {
                        yylval.number = strtol(yytext + 1, NULL, 8);
                        return number;
                }