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| author | lucien <lucien.xin@gmail.com> | 2015-08-27 16:26:34 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-08-27 13:59:33 -0700 |
| commit | ce7b4ccc4f62775f4167495a06fbee0025f87175 (patch) | |
| tree | 695c1ad3be0a2de54f8713c378a4d0160fc58c8a | |
| parent | fbe4307e9ffd9b9c9d4631a37c8f16080da8df85 (diff) | |
| download | lwn-ce7b4ccc4f62775f4167495a06fbee0025f87175.tar.gz lwn-ce7b4ccc4f62775f4167495a06fbee0025f87175.zip | |
sctp: asconf's process should verify address parameter is in the beginning
in sctp_process_asconf(), we get address parameter from the beginning of
the addip params. but we never check if it's really there. if the addr
param is not there, it still can pass sctp_verify_asconf(), then to be
handled by sctp_process_asconf(), it will not be safe.
so add a code in sctp_verify_asconf() to check the address parameter is in
the beginning, or return false to send abort.
note that this can also detect multiple address parameters, and reject it.
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: Marcelo Ricardo Leitner <mleitner@redhat.com>
Acked-by: Vlad Yasevich <vyasevich@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/sctp/sm_make_chunk.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c index 06320c8c1c86..a655ddc3f353 100644 --- a/net/sctp/sm_make_chunk.c +++ b/net/sctp/sm_make_chunk.c @@ -3132,11 +3132,18 @@ bool sctp_verify_asconf(const struct sctp_association *asoc, case SCTP_PARAM_IPV4_ADDRESS: if (length != sizeof(sctp_ipv4addr_param_t)) return false; + /* ensure there is only one addr param and it's in the + * beginning of addip_hdr params, or we reject it. + */ + if (param.v != addip->addip_hdr.params) + return false; addr_param_seen = true; break; case SCTP_PARAM_IPV6_ADDRESS: if (length != sizeof(sctp_ipv6addr_param_t)) return false; + if (param.v != addip->addip_hdr.params) + return false; addr_param_seen = true; break; case SCTP_PARAM_ADD_IP: |