Commit 8207c6dd authored Dec 22, 2017 by Jakub Kicinski Committed by Daniel Borkmann Dec 23, 2017

tools: bpftool: protect against races with disappearing objects



On program/map show we may get an ID of an object from GETNEXT,
but the object may disappear before we call GET_FD_BY_ID.  If
that happens, ignore the object and continue.

Fixes: 71bb428f ("tools: bpf: add bpftool")
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Acked-by: Quentin Monnet <quentin.monnet@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

parent b3b1b653

tools/bpf/bpftool/map.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -528,6 +528,8 @@ static int do_show(int argc, char **argv)

		fd = bpf_map_get_fd_by_id(id);
		if (fd < 0) {
		if (errno == ENOENT)
		continue;
		p_err("can't get map by id (%u): %s",
		id, strerror(errno));
		break;

tools/bpf/bpftool/prog.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -382,6 +382,8 @@ static int do_show(int argc, char **argv)

		fd = bpf_prog_get_fd_by_id(id);
		if (fd < 0) {
		if (errno == ENOENT)
		continue;
		p_err("can't get prog by id (%u): %s",
		id, strerror(errno));
		err = -1;