From 9656b346b280c3e49c8a116c3a715f966633b161 Mon Sep 17 00:00:00 2001 From: Andrii Nakryiko Date: Wed, 6 Nov 2019 21:40:59 -0800 Subject: libbpf: Fix negative FD close() in xsk_setup_xdp_prog() Fix issue reported by static analysis (Coverity). If bpf_prog_get_fd_by_id() fails, xsk_lookup_bpf_maps() will fail as well and clean-up code will attempt close() with fd=-1. Fix by checking bpf_prog_get_fd_by_id() return result and exiting early. Fixes: 10a13bb40e54 ("libbpf: remove qidconf and better support external bpf programs.") Signed-off-by: Andrii Nakryiko Signed-off-by: Daniel Borkmann Link: https://lore.kernel.org/bpf/20191107054059.313884-1-andriin@fb.com --- tools/lib/bpf/xsk.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'tools/lib') diff --git a/tools/lib/bpf/xsk.c b/tools/lib/bpf/xsk.c index 74d84f36a5b2..86c1b61017f6 100644 --- a/tools/lib/bpf/xsk.c +++ b/tools/lib/bpf/xsk.c @@ -553,6 +553,8 @@ static int xsk_setup_xdp_prog(struct xsk_socket *xsk) } } else { xsk->prog_fd = bpf_prog_get_fd_by_id(prog_id); + if (xsk->prog_fd < 0) + return -errno; err = xsk_lookup_bpf_maps(xsk); if (err) { close(xsk->prog_fd); -- cgit