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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>
This commit is contained in:
Tetsuo Handa 2019-04-12 19:55:47 +09:00 committed by David S. Miller
parent c68e747d0a
commit ba024f2574
1 changed files with 2 additions and 0 deletions
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2
net/core/filter.c
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@ -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;