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| author |   Andrii Nakryiko <andriin@fb.com> | 2019-11-06 21:40:59 -0800 |
|---|---|---|
| committer |   Daniel Borkmann <daniel@iogearbox.net> | 2019-11-07 16:15:27 +0100 |
| commit | 9656b346b280c3e49c8a116c3a715f966633b161 (patch) | |
| tree | 67930b0a4a9a805df41fb87b1905806f69db7f8d | |
| parent | s390/bpf: Remove unused SEEN_RET0, SEEN_REG_AX and ret0_ip (diff) | |
| download | linux-dev-9656b346b280c3e49c8a116c3a715f966633b161.tar.xz linux-dev-9656b346b280c3e49c8a116c3a715f966633b161.zip | |
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 <andriin@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20191107054059.313884-1-andriin@fb.com
| -rw-r--r-- | tools/lib/bpf/xsk.c | 2 |
1 files changed, 2 insertions, 0 deletions
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); |