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authorJiri Olsa <jolsa@kernel.org>2022-03-16 13:24:08 +0100
committerAlexei Starovoitov <ast@kernel.org>2022-03-17 20:17:18 -0700
commitaecf489f2ce51436402818c96639ed6303b540f8 (patch)
treec69559dda35ec2e21d9e712703cbbb0fdd569cca
parenta0019cd7d41a191253859349535d76ee28ab7d96 (diff)
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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.c4
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));