diff options
| author | Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> | 2019-04-12 19:56:39 +0900 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-04-12 10:25:03 -0700 |
| commit | bddc028a4f2ac8cf4d0cd1c696b5f95d8305a553 (patch) | |
| tree | 22ffe3c231a56ec63e3296cd85141e27014ef339 /net | |
| parent | ba024f2574a19557f92116ec6be129b26ae66e97 (diff) | |
udpv6: Check address length before reading address family
KMSAN will complain if valid address length passed to udpv6_pre_connect()
is shorter than sizeof("struct sockaddr"->sa_family) bytes.
(This patch is bogus if it is guaranteed that udpv6_pre_connect() is
always called after checking "struct sockaddr"->sa_family. In that case,
we want a comment why we don't need to check valid address length here.)
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv6/udp.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c index b444483cdb2b..622eeaf5732b 100644 --- a/net/ipv6/udp.c +++ b/net/ipv6/udp.c @@ -1047,6 +1047,8 @@ static void udp_v6_flush_pending_frames(struct sock *sk) static int udpv6_pre_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) { + if (addr_len < offsetofend(struct sockaddr, sa_family)) + return -EINVAL; /* The following checks are replicated from __ip6_datagram_connect() * and intended to prevent BPF program called below from accessing * bytes that are out of the bound specified by user in addr_len. |