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sctp: Check address length before reading address family

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

Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tetsuo Handa 2019-04-12 19:53:10 +09:00 • committed by David S. Miller
parent 238ffdc49e
commit 175f7c1f01
1 changed files with 2 additions and 1 deletions
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3
net/sctp/socket.c
View file

@ -4847,7 +4847,8 @@ static int sctp_connect(struct sock *sk, struct sockaddr *addr,
}
/* Validate addr_len before calling common connect/connectx routine. */
af = sctp_get_af_specific(addr->sa_family);
af = addr_len < offsetofend(struct sockaddr, sa_family) ? NULL :
sctp_get_af_specific(addr->sa_family);
if (!af || addr_len < af->sockaddr_len) {
err = -EINVAL;
} else {