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authorPeng Sun <sironhide0null@gmail.com>2019-02-27 15:36:25 +0100
committerDaniel Borkmann <daniel@iogearbox.net>2019-03-01 16:04:29 +0100
commit352d20d611414715353ee65fc206ee57ab1a6984 (patch)
treec856f1153a8c8551c974aa908088bdd1fe6499ac /kernel/bpf
parentbpf: decrease usercnt if bpf_map_new_fd() fails in bpf_map_get_fd_by_id() (diff)
downloadlinux-352d20d611414715353ee65fc206ee57ab1a6984.tar.xz
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bpf: drop refcount if bpf_map_new_fd() fails in map_create()
In bpf/syscall.c, map_create() first set map->usercnt to 1, a file descriptor is supposed to return to userspace. When bpf_map_new_fd() fails, drop the refcount. Fixes: bd5f5f4ecb78 ("bpf: Add BPF_MAP_GET_FD_BY_ID") Signed-off-by: Peng Sun <sironhide0null@gmail.com> Acked-by: Martin KaFai Lau <kafai@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to '')
-rw-r--r--kernel/bpf/syscall.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index f98328abe8fa..84470d1480aa 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -559,12 +559,12 @@ static int map_create(union bpf_attr *attr)
err = bpf_map_new_fd(map, f_flags);
if (err < 0) {
/* failed to allocate fd.
- * bpf_map_put() is needed because the above
+ * bpf_map_put_with_uref() is needed because the above
* bpf_map_alloc_id() has published the map
* to the userspace and the userspace may
* have refcnt-ed it through BPF_MAP_GET_FD_BY_ID.
*/
- bpf_map_put(map);
+ bpf_map_put_with_uref(map);
return err;
}