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kallsyms: Skip the name search for empty string

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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: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20220316122419.933957-3-jolsa@kernel.org
This commit is contained in:
Jiri Olsa 2022-03-16 13:24:08 +01:00 committed by Alexei Starovoitov
parent a0019cd7d4
commit aecf489f2c
1 changed files with 4 additions and 0 deletions
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4
kernel/kallsyms.c
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@ -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));