From: Jiri Olsa <jolsa@kernel.org>
Date: Wed, 16 Mar 2022 12:24:08 +0000 (+0100)
Subject: kallsyms: Skip the name search for empty string
X-Git-Tag: v6.1-rc5~1746^2~11^2~28^2~11
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=aecf489f2ce51436402818c96639ed6303b540f8;p=platform%2Fkernel%2Flinux-starfive.git

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
---

diff --git a/kernel/kallsyms.c b/kernel/kallsyms.c
index 951c932..79f2eb6 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));