Commit aecf489f authored by Jiri Olsa's avatar Jiri Olsa Committed by Alexei Starovoitov
Browse files

kallsyms: Skip the name search for empty string 



When kallsyms_lookup_name is called with empty string,
it will do futile search for it through all the symbols.

Skipping the search for empty string.

Signed-off-by: default avatarJiri Olsa <jolsa@kernel.org>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20220316122419.933957-3-jolsa@kernel.org
parent a0019cd7

kernel/kallsyms.c

+4 −0
Original line number Diff line number Diff line
@@ -212,6 +212,10 @@ unsigned long kallsyms_lookup_name(const char *name) 
	unsigned long i;

	unsigned int off;



	/* Skip the search for empty string. */

	if (!*name)

		return 0;



	for (i = 0, off = 0; i < kallsyms_num_syms; i++) {

		off = kallsyms_expand_symbol(off, namebuf, ARRAY_SIZE(namebuf));