Commit ba024f25 authored Apr 12, 2019 by Tetsuo Handa Committed by David S. Miller Apr 12, 2019

bpf: Check address length before reading address family



KMSAN will complain if valid address length passed to bpf_bind() is
shorter than sizeof("struct sockaddr"->sa_family) bytes.

Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Acked-by: Andrey Ignatov <rdna@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent c68e747d

net/core/filter.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -4383,6 +4383,8 @@ BPF_CALL_3(bpf_bind, struct bpf_sock_addr_kern , ctx, struct sockaddr , addr,
		* Only binding to IP is supported.
		*/
		err = -EINVAL;
		if (addr_len < offsetofend(struct sockaddr, sa_family))
		return err;
		if (addr->sa_family == AF_INET) {
		if (addr_len < sizeof(struct sockaddr_in))
		return err;