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Message-Id: <20220316122419.933957-3-jolsa@kernel.org>
Date: Wed, 16 Mar 2022 13:24:08 +0100
From: Jiri Olsa <jolsa@...nel.org>
To: Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Andrii Nakryiko <andrii@...nel.org>,
Masami Hiramatsu <mhiramat@...nel.org>
Cc: netdev@...r.kernel.org, bpf@...r.kernel.org,
lkml <linux-kernel@...r.kernel.org>,
Martin KaFai Lau <kafai@...com>,
Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
John Fastabend <john.fastabend@...il.com>,
KP Singh <kpsingh@...omium.org>,
Steven Rostedt <rostedt@...dmis.org>
Subject: [PATCHv3 bpf-next 02/13] 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@...nel.org>
---
kernel/kallsyms.c | 4 ++++
1 file changed, 4 insertions(+)
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));
--
2.35.1
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