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Date: Tue, 26 Feb 2019 22:15:37 +0800 From: zerons <sironhide0null@...il.com> To: ast@...nel.org, daniel@...earbox.net Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org Subject: [PATCH] bpf: decrease usercnt if bpf_map_new_fd() fails in bpf_map_get_fd_by_id() [ Upstream commit c91951f15978f1a0c6b65f063d30f7ea7bc6fb42 ] 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. Signed-off-by: zerons <sironhide0null@...il.com> --- kernel/bpf/syscall.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c index cf5040f..db1ed12 100644 --- a/kernel/bpf/syscall.c +++ b/kernel/bpf/syscall.c @@ -1966,7 +1966,7 @@ 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; } -- 2.7.4
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