diff options
| author | Martynas Pumputis <m@lambda.lt> | 2021-07-19 20:38:37 +0300 |
|---|---|---|
| committer | Andrii Nakryiko <andrii@kernel.org> | 2021-07-20 01:48:20 +0300 |
| commit | a21ab4c59e09c2a9994a6e393b7484e3b3f78a99 (patch) | |
| tree | 5a6fd6fbc93e3cea9b9322980972ab28238da08d /tools/lib | |
| parent | 78e4a955928ef4a3e68cc371ac8c70fd150f873b (diff) | |
| download | linux-a21ab4c59e09c2a9994a6e393b7484e3b3f78a99.tar.xz | |
libbpf: Fix removal of inner map in bpf_object__create_map
If creating an outer map of a BTF-defined map-in-map fails (via
bpf_object__create_map()), then the previously created its inner map
won't be destroyed.
Fix this by ensuring that the destroy routines are not bypassed in the
case of a failure.
Fixes: 646f02ffdd49c ("libbpf: Add BTF-defined map-in-map support")
Reported-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Martynas Pumputis <m@lambda.lt>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/20210719173838.423148-2-m@lambda.lt
Diffstat (limited to 'tools/lib')
| -rw-r--r-- | tools/lib/bpf/libbpf.c | 10 |
1 files changed, 4 insertions, 6 deletions
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c index 17bc922f543f..4c153c379989 100644 --- a/tools/lib/bpf/libbpf.c +++ b/tools/lib/bpf/libbpf.c @@ -4527,6 +4527,7 @@ static int bpf_object__create_map(struct bpf_object *obj, struct bpf_map *map, b { struct bpf_create_map_attr create_attr; struct bpf_map_def *def = &map->def; + int err = 0; memset(&create_attr, 0, sizeof(create_attr)); @@ -4569,8 +4570,6 @@ static int bpf_object__create_map(struct bpf_object *obj, struct bpf_map *map, b if (bpf_map_type__is_map_in_map(def->type)) { if (map->inner_map) { - int err; - err = bpf_object__create_map(obj, map->inner_map, true); if (err) { pr_warn("map '%s': failed to create inner map: %d\n", @@ -4595,8 +4594,8 @@ static int bpf_object__create_map(struct bpf_object *obj, struct bpf_map *map, b if (map->fd < 0 && (create_attr.btf_key_type_id || create_attr.btf_value_type_id)) { char *cp, errmsg[STRERR_BUFSIZE]; - int err = -errno; + err = -errno; cp = libbpf_strerror_r(err, errmsg, sizeof(errmsg)); pr_warn("Error in bpf_create_map_xattr(%s):%s(%d). Retrying without BTF.\n", map->name, cp, err); @@ -4608,8 +4607,7 @@ static int bpf_object__create_map(struct bpf_object *obj, struct bpf_map *map, b map->fd = bpf_create_map_xattr(&create_attr); } - if (map->fd < 0) - return -errno; + err = map->fd < 0 ? -errno : 0; if (bpf_map_type__is_map_in_map(def->type) && map->inner_map) { if (obj->gen_loader) @@ -4618,7 +4616,7 @@ static int bpf_object__create_map(struct bpf_object *obj, struct bpf_map *map, b zfree(&map->inner_map); } - return 0; + return err; } static int init_map_slots(struct bpf_object *obj, struct bpf_map *map) |