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| author | Peng Sun <sironhide0null@gmail.com> | 2019-02-26 22:15:37 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-12-05 09:21:13 +0100 |
| commit | 944df7b4b9dc1a75ec13e48505402bcc96906a89 (patch) | |
| tree | d7c5562e489e3feabba6d6c76c880428e8afe5d1 /kernel | |
| parent | ddb2badbe975c95841527aff47107bb44ec47009 (diff) | |
| download | linux-stable-944df7b4b9dc1a75ec13e48505402bcc96906a89.tar.gz linux-stable-944df7b4b9dc1a75ec13e48505402bcc96906a89.tar.bz2 linux-stable-944df7b4b9dc1a75ec13e48505402bcc96906a89.zip | |
bpf: decrease usercnt if bpf_map_new_fd() fails in bpf_map_get_fd_by_id()
[ Upstream commit 781e62823cb81b972dc8652c1827205cda2ac9ac ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/bpf/syscall.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c index 6e544e364821..90bb0c05c10e 100644 --- a/kernel/bpf/syscall.c +++ b/kernel/bpf/syscall.c @@ -1887,7 +1887,7 @@ 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; } |