sctp: check invalid value of length parameter in error cause

RFC4960, section 3.3.7 said:
 If an endpoint receives an ABORT with a format error or no TCB is
 found, it MUST silently discard it.

When an endpoint receives ABORT that parameter value is invalid,
drop it.

Signed-off-by: Shan Wei <shanwei@cn.fujitsu.com>
Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 8 insertions, 1 deletions

diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c
index fe2036d79f53..194d5ecab5c3 100644
--- a/net/sctp/sm_statefuns.c
+++ b/net/sctp/sm_statefuns.c
@@ -2412,8 +2412,15 @@ static sctp_disposition_t __sctp_sf_do_9_1_abort(const struct sctp_endpoint *ep,
 
         /* See if we have an error cause code in the chunk.  */
         len = ntohs(chunk->chunk_hdr->length);
-        if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_errhdr))
+        if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_errhdr)) {
+
+                sctp_errhdr_t *err;
+                sctp_walk_errors(err, chunk->chunk_hdr);
+                if ((void *)err != (void *)chunk->chunk_end)
+                        return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
+
                 error = ((sctp_errhdr_t *)chunk->skb->data)->cause;
+        }
 
         sctp_add_cmd_sf(commands, SCTP_CMD_SET_SK_ERR, SCTP_ERROR(ECONNRESET));
         /* ASSOC_FAILED will DELETE_TCB. */