mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-10-01 06:33:07 +00:00
Code Issues Releases Wiki Activity

libbpf: Fix negative FD close() in xsk_setup_xdp_prog()

Browse source 
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: 10a13bb40e ("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
This commit is contained in:
Andrii Nakryiko 2019-11-06 21:40:59 -08:00 committed by Daniel Borkmann
parent dab2e9eb18
commit 9656b346b2
1 changed files with 2 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
tools/lib/bpf/xsk.c
View file

@ -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);