--- /dev/null
+commit 06f7ebb1dade2f0dbf872ea2bedf17cff4734bdd
+Author: Olaf Kirch <okir@...e.de>
+Date: Thu Aug 6 16:27:20 2015 +0200
+
+ Fix memory corruption in PMAP_CALLIT code
+
+ - A PMAP_CALLIT call comes in on IPv4 UDP
+ - rpcbind duplicates the caller's address to a netbuf and stores it in
+ FINFO[0].caller_addr. caller_addr->buf now points to a memory region A
+ with a size of 16 bytes
+ - rpcbind forwards the call to the local service, receives a reply
+ - when processing the reply, it does this in xprt_set_caller:
+ xprt->xp_rtaddr = *FINFO[0].caller_addr
+ It sends out the reply, and then frees the netbuf caller_addr and
+ caller_addr.buf.
+ However, it does not clear xp_rtaddr, so xp_rtaddr.buf now refers
+ to memory region A, which is free.
+ - When the next call comes in on the UDP/IPv4 socket, svc_dg_recv will
+ be called, which will set xp_rtaddr to the client's address.
+ It will reuse the buffer inside xp_rtaddr, ie it will write a
+ sockaddr_in to region A
+
+ Some time down the road, an incoming TCP connection is accepted,
+ allocating a fresh SVCXPRT. The memory region A is inside the
+ new SVCXPRT
+
+ - While processing the TCP call, another UDP call comes in, again
+ overwriting region A with the client's address
+ - TCP client closes connection. In svc_destroy, we now trip over
+ the garbage left in region A
+
+ We ran into the case where a commercial scanner was triggering
+ occasional rpcbind segfaults. The core file that was captured showed
+ a corrupted xprt->xp_netid pointer that was really a sockaddr_in.
+
+ Signed-off-by: Olaf Kirch <okir@...e.de>
+
+ Upstream-Status: Backport
+
+ Signed-off-by: Li Zhou <li.zhou@windriver.com>
+---
+ src/rpcb_svc_com.c | 23 ++++++++++++++++++++++-
+ 1 file changed, 22 insertions(+), 1 deletion(-)
+
+Index: rpcbind-0.1.6+git20080930/src/rpcb_svc_com.c
+===================================================================
+--- rpcbind-0.1.6+git20080930.orig/src/rpcb_svc_com.c
++++ rpcbind-0.1.6+git20080930/src/rpcb_svc_com.c
+@@ -1298,12 +1298,33 @@ check_rmtcalls(struct pollfd *pfds, int
+ return (ncallbacks_found);
+ }
+
++/*
++ * This is really a helper function defined in libtirpc, but unfortunately, it hasn't
++ * been exported yet.
++ */
++static struct netbuf *
++__rpc_set_netbuf(struct netbuf *nb, const void *ptr, size_t len)
++{
++ if (nb->len != len) {
++ if (nb->len)
++ mem_free(nb->buf, nb->len);
++ nb->buf = mem_alloc(len);
++ if (nb->buf == NULL)
++ return NULL;
++
++ nb->maxlen = nb->len = len;
++ }
++ memcpy(nb->buf, ptr, len);
++ return nb;
++}
++
+ static void
+ xprt_set_caller(SVCXPRT *xprt, struct finfo *fi)
+ {
++ const struct netbuf *caller = fi->caller_addr;
+ u_int32_t *xidp;
+
+- *(svc_getrpccaller(xprt)) = *(fi->caller_addr);
++ __rpc_set_netbuf(svc_getrpccaller(xprt), caller->buf, caller->len);
+ xidp = __rpcb_get_dg_xidp(xprt);
+ *xidp = fi->caller_xid;
+ }
