bpftool: Fix error check when calling hashmap__new()

hashmap__new() encodes errors with ERR_PTR(), hence it's not valid to
check the returned pointer against NULL and IS_ERR() has to be used
instead.

libbpf_get_error() can't be used in this case as hashmap__new() is not
part of the public libbpf API and it'll continue using ERR_PTR() after
libbpf 1.0.

Fixes: 8f184732b60b ("bpftool: Switch to libbpf's hashmap for pinned paths of BPF objects")
Fixes: 2828d0d75b73 ("bpftool: Switch to libbpf's hashmap for programs/maps in BTF listing")
Fixes: d6699f8e0f83 ("bpftool: Switch to libbpf's hashmap for PIDs/names references")
Signed-off-by: Mauricio Vásquez <mauricio@kinvolk.io>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Reviewed-by: Quentin Monnet <quentin@isovalent.com>
Acked-by: Song Liu <songliubraving@fb.com>
Link: https://lore.kernel.org/bpf/20220107152620.192327-2-mauricio@kinvolk.io

diff --git a/tools/bpf/bpftool/btf.c b/tools/bpf/bpftool/btf.c
index 5983312..a2c665b 100644 (file)
--- a/tools/bpf/bpftool/btf.c
+++ b/tools/bpf/bpftool/btf.c
@@ -902,7 +902,7 @@ static int do_show(int argc, char **argv)
                                      equal_fn_for_key_as_id, NULL);
        btf_map_table = hashmap__new(hash_fn_for_key_as_id,
                                     equal_fn_for_key_as_id, NULL);
-       if (!btf_prog_table || !btf_map_table) {
+       if (IS_ERR(btf_prog_table) || IS_ERR(btf_map_table)) {
                hashmap__free(btf_prog_table);
                hashmap__free(btf_map_table);
                if (fd >= 0)

diff --git a/tools/bpf/bpftool/link.c b/tools/bpf/bpftool/link.c
index 2c258db..97dec81 100644 (file)
--- a/tools/bpf/bpftool/link.c
+++ b/tools/bpf/bpftool/link.c
@@ -2,6 +2,7 @@
 /* Copyright (C) 2020 Facebook */
 
 #include <errno.h>
+#include <linux/err.h>
 #include <net/if.h>
 #include <stdio.h>
 #include <unistd.h>
@@ -306,7 +307,7 @@ static int do_show(int argc, char **argv)
        if (show_pinned) {
                link_table = hashmap__new(hash_fn_for_key_as_id,
                                          equal_fn_for_key_as_id, NULL);
-               if (!link_table) {
+               if (IS_ERR(link_table)) {
                        p_err("failed to create hashmap for pinned paths");
                        return -1;
                }

diff --git a/tools/bpf/bpftool/map.c b/tools/bpf/bpftool/map.c
index cc530a2..c66a3c9 100644 (file)
--- a/tools/bpf/bpftool/map.c
+++ b/tools/bpf/bpftool/map.c
@@ -699,7 +699,7 @@ static int do_show(int argc, char **argv)
        if (show_pinned) {
                map_table = hashmap__new(hash_fn_for_key_as_id,
                                         equal_fn_for_key_as_id, NULL);
-               if (!map_table) {
+               if (IS_ERR(map_table)) {
                        p_err("failed to create hashmap for pinned paths");
                        return -1;
                }

diff --git a/tools/bpf/bpftool/pids.c b/tools/bpf/bpftool/pids.c
index 56b598e..7c384d1 100644 (file)
--- a/tools/bpf/bpftool/pids.c
+++ b/tools/bpf/bpftool/pids.c
@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 /* Copyright (C) 2020 Facebook */
 #include <errno.h>
+#include <linux/err.h>
 #include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -101,7 +102,7 @@ int build_obj_refs_table(struct hashmap **map, enum bpf_obj_type type)
        libbpf_print_fn_t default_print;
 
        *map = hashmap__new(hash_fn_for_key_as_id, equal_fn_for_key_as_id, NULL);
-       if (!*map) {
+       if (IS_ERR(*map)) {
                p_err("failed to create hashmap for PID references");
                return -1;
        }

diff --git a/tools/bpf/bpftool/prog.c b/tools/bpf/bpftool/prog.c
index 2a21d50..33ca834 100644 (file)
--- a/tools/bpf/bpftool/prog.c
+++ b/tools/bpf/bpftool/prog.c
@@ -641,7 +641,7 @@ 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;
                }