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authorXin Long <lucien.xin@gmail.com>2017-02-07 20:56:08 +0800
committerDavid S. Miller <davem@davemloft.net>2017-02-07 14:07:23 -0500
commit912964eacb111551db73429719eb5fadcab0ff8a (patch)
tree9ed1ca48c2fa569d1a974fb2b0bbfb9871d8b343 /net
parent2dcab598484185dea7ec22219c76dcdd59e3cb90 (diff)
downloadlinux-912964eacb111551db73429719eb5fadcab0ff8a.tar.bz2
sctp: check af before verify address in sctp_addr_id2transport
Commit 6f29a1306131 ("sctp: sctp_addr_id2transport should verify the addr before looking up assoc") invoked sctp_verify_addr to verify the addr. But it didn't check af variable beforehand, once users pass an address with family = 0 through sockopt, sctp_get_af_specific will return NULL and NULL pointer dereference will be caused by af->sockaddr_len. This patch is to fix it by returning NULL if af variable is NULL. Fixes: 6f29a1306131 ("sctp: sctp_addr_id2transport should verify the addr before looking up assoc") Signed-off-by: Xin Long <lucien.xin@gmail.com> Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/sctp/socket.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index e214d2e7e9a3..1b5d669e3029 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -239,7 +239,7 @@ static struct sctp_transport *sctp_addr_id2transport(struct sock *sk,
union sctp_addr *laddr = (union sctp_addr *)addr;
struct sctp_transport *transport;
- if (sctp_verify_addr(sk, laddr, af->sockaddr_len))
+ if (!af || sctp_verify_addr(sk, laddr, af->sockaddr_len))
return NULL;
addr_asoc = sctp_endpoint_lookup_assoc(sctp_sk(sk)->ep,