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| author | Jiri Olsa <jolsa@kernel.org> | 2022-03-16 13:24:08 +0100 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2022-03-17 20:17:18 -0700 |
| commit | aecf489f2ce51436402818c96639ed6303b540f8 (patch) | |
| tree | c69559dda35ec2e21d9e712703cbbb0fdd569cca | |
| parent | a0019cd7d41a191253859349535d76ee28ab7d96 (diff) | |
| download | linux-aecf489f2ce51436402818c96639ed6303b540f8.tar.gz linux-aecf489f2ce51436402818c96639ed6303b540f8.tar.bz2 linux-aecf489f2ce51436402818c96639ed6303b540f8.zip | |
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: 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
| -rw-r--r-- | kernel/kallsyms.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/kernel/kallsyms.c b/kernel/kallsyms.c index 951c93216fc4..79f2eb617a62 100644 --- a/kernel/kallsyms.c +++ b/kernel/kallsyms.c @@ -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)); |