From: Peng Sun <sironhide0null@gmail.com>
Date: Tue, 26 Feb 2019 14:15:37 +0000 (+0800)
Subject: bpf: decrease usercnt if bpf_map_new_fd() fails in bpf_map_get_fd_by_id()
X-Git-Tag: v5.0~4^2~3^2~3
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=781e62823cb81b972dc8652c1827205cda2ac9ac;p=users%2Fjedix%2Flinux-maple.git

bpf: decrease usercnt if bpf_map_new_fd() fails in bpf_map_get_fd_by_id()

In bpf/syscall.c, bpf_map_get_fd_by_id() use bpf_map_inc_not_zero()
to increase the refcount, both map->refcnt and map->usercnt. Then, if
bpf_map_new_fd() fails, should handle map->usercnt too.

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: Daniel Borkmann <daniel@iogearbox.net>
---

diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index 8577bb7f8be6..f98328abe8fa 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -1986,7 +1986,7 @@ static int bpf_map_get_fd_by_id(const union bpf_attr *attr)
 
 	fd = bpf_map_new_fd(map, f_flags);
 	if (fd < 0)
-		bpf_map_put(map);
+		bpf_map_put_with_uref(map);
 
 	return fd;
 }