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authorMartynas Pumputis <m@lambda.lt>2021-07-19 20:38:37 +0300
committerAndrii Nakryiko <andrii@kernel.org>2021-07-20 01:48:20 +0300
commita21ab4c59e09c2a9994a6e393b7484e3b3f78a99 (patch)
tree5a6fd6fbc93e3cea9b9322980972ab28238da08d /tools/lib
parent78e4a955928ef4a3e68cc371ac8c70fd150f873b (diff)
downloadlinux-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.c10
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)