netdev - [PATCH] bpftool: Fix NULL vs IS_ERR() checking in do

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Message-Id: <20211212044212.12551-1-linmq006@gmail.com>
Date:   Sun, 12 Dec 2021 04:42:08 +0000
From:   Miaoqian Lin <linmq006@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     linmq006@...il.com, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Quentin Monnet <quentin@...valent.com>,
        Cong Wang <cong.wang@...edance.com>,
        Hengqi Chen <hengqi.chen@...il.com>, netdev@...r.kernel.org,
        bpf@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] bpftool: Fix NULL vs IS_ERR() checking in do_show()

 The hashmap__new() function does not return NULL on errors. It returns
 ERR_PTR(-ENOMEM). Using IS_ERR() to check the return value
 to fix this.

Signed-off-by: Miaoqian Lin <linmq006@...il.com>
---
 tools/bpf/bpftool/prog.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/bpf/bpftool/prog.c b/tools/bpf/bpftool/prog.c
index 515d22952602..564a15f881c6 100644
--- a/tools/bpf/bpftool/prog.c
+++ b/tools/bpf/bpftool/prog.c
@@ -571,7 +571,7 @@ static int do_show(int argc, char **argv)
 	if (show_pinned) {
 		prog_table = hashmap__new(hash_fn_for_key_as_id,
 					  equal_fn_for_key_as_id, NULL);
-		if (!prog_table) {
+		if (IS_ERR(prog_table)) {
 			p_err("failed to create hashmap for pinned paths");
 			return -1;
 		}
-- 
2.17.1