s3:rpc_server: Fix talloc_free() with references error on server exit

Fixes talloc_free() with references when smbd exists and talloc_free the
global dcesrv context:

ERROR: talloc_free with references at ../../source3/rpc_server/rpc_config.c:73
	reference at ../../source3/rpc_server/rpc_server.c:193
	reference at ../../source3/rpc_server/rpc_server.c:592
	...

The talloc_reference to make the dcerpc_ncacn_listen_state a parent of
the dcesrv context is not necessary as the listen state is allocated
under the endpoint, which is allocated under the dcesrv context:

full talloc report on 'struct dcesrv_context' (total  12298 bytes in 188 blocks)
    ...
    struct dcesrv_endpoint         contains    691 bytes in  11 blocks (ref 0) 0x55ae964d79a0
        struct dcerpc_ncacn_listen_state contains    160 bytes in   2 blocks (ref 0) 0x55ae964fca60
            struct tevent_fd               contains    104 bytes in   1 blocks (ref 0) 0x55ae964f36f0
        struct dcesrv_if_list          contains    128 bytes in   2 blocks (ref 0) 0x55ae964e8a40
            ../../librpc/rpc/dcesrv_core.c:360 contains    104 bytes in   1 blocks (ref 0) 0x55ae964e8ac0
        struct dcesrv_if_list          contains    128 bytes in   2 blocks (ref 0) 0x55ae964e8870
            ../../librpc/rpc/dcesrv_core.c:327 contains    104 bytes in   1 blocks (ref 0) 0x55ae964e8970
        struct dcerpc_binding          contains    108 bytes in   2 blocks (ref 0) 0x55ae964e87a0
            \pipe\lsass                    contains     12 bytes in   1 blocks (ref 0) 0x55ae964e88f0
        struct dcerpc_binding          contains    111 bytes in   2 blocks (ref 0) 0x55ae964e86d0
            \pipe\netlogon                 contains     15 bytes in   1 blocks (ref 0) 0x55ae964e8650
    ...
    struct dcesrv_endpoint         contains   1728 bytes in  27 blocks (ref 0) 0x55ae964e0db0
        struct dcerpc_ncacn_listen_state contains    160 bytes in   2 blocks (ref 0) 0x55ae964fd540
            struct tevent_fd               contains    104 bytes in   1 blocks (ref 0) 0x55ae964f3890
        struct dcesrv_if_list          contains    128 bytes in   2 blocks (ref 0) 0x55ae964fbd70
            ../../librpc/rpc/dcesrv_core.c:360 contains    104 bytes in   1 blocks (ref 0) 0x55ae964f67a0
        struct dcesrv_if_list          contains    128 bytes in   2 blocks (ref 0) 0x55ae964fff60
            ../../librpc/rpc/dcesrv_core.c:360 contains    104 bytes in   1 blocks (ref 0) 0x55ae964f66c0
        struct dcesrv_if_list          contains    128 bytes in   2 blocks (ref 0) 0x55ae964eb8b0
            ../../librpc/rpc/dcesrv_core.c:360 contains    104 bytes in   1 blocks (ref 0) 0x55ae964eba00
        struct dcesrv_if_list          contains    128 bytes in   2 blocks (ref 0) 0x55ae964eb200
            ../../librpc/rpc/dcesrv_core.c:360 contains    104 bytes in   1 blocks (ref 0) 0x55ae964eb350
        struct dcesrv_if_list          contains    128 bytes in   2 blocks (ref 0) 0x55ae964eab70
            ../../librpc/rpc/dcesrv_core.c:360 contains    104 bytes in   1 blocks (ref 0) 0x55ae964eabf0
        struct dcesrv_if_list          contains    128 bytes in   2 blocks (ref 0) 0x55ae964ea360
            ../../librpc/rpc/dcesrv_core.c:360 contains    104 bytes in   1 blocks (ref 0) 0x55ae964ea4b0
        struct dcesrv_if_list          contains    128 bytes in   2 blocks (ref 0) 0x55ae964e9cb0
            ../../librpc/rpc/dcesrv_core.c:360 contains    104 bytes in   1 blocks (ref 0) 0x55ae964e9e00
        struct dcesrv_if_list          contains    128 bytes in   2 blocks (ref 0) 0x55ae964e96a0
            ../../librpc/rpc/dcesrv_core.c:360 contains    104 bytes in   1 blocks (ref 0) 0x55ae964e97f0
        struct dcesrv_if_list          contains    128 bytes in   2 blocks (ref 0) 0x55ae964e8430
            ../../librpc/rpc/dcesrv_core.c:360 contains    104 bytes in   1 blocks (ref 0) 0x55ae964e8580
        struct dcesrv_if_list          contains    128 bytes in   2 blocks (ref 0) 0x55ae964e6250
            ../../librpc/rpc/dcesrv_core.c:360 contains    104 bytes in   1 blocks (ref 0) 0x55ae964e8070
        struct dcesrv_if_list          contains    128 bytes in   2 blocks (ref 0) 0x55ae964e7e50
            ../../librpc/rpc/dcesrv_core.c:327 contains    104 bytes in   1 blocks (ref 0) 0x55ae964e7fa0
        struct dcerpc_binding          contains    104 bytes in   2 blocks (ref 0) 0x55ae964e7ed0
            DEFAULT                        contains      8 bytes in   1 blocks (ref 0) 0x55ae964eaa10
    ....

Signed-off-by: Samuel Cabrero <scabrero@samba.org>
Reviewed-by: Andrew Bartlet <abartlet@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>

Autobuild-User(master): Andreas Schneider <asn@cryptomilk.org>
Autobuild-Date(master): Wed Apr  1 10:28:43 UTC 2020 on sn-devel-184

1 files changed, 3 insertions, 3 deletions

diff --git a/source3/rpc_server/rpc_server.c b/source3/rpc_server/rpc_server.c
index 60175575018..d34f85538cd 100644
--- a/source3/rpc_server/rpc_server.c
+++ b/source3/rpc_server/rpc_server.c
@@ -190,7 +190,7 @@ NTSTATUS dcesrv_setup_ncacn_np_socket(struct tevent_context *ev_ctx,
 	state->ev_ctx = ev_ctx;
 	state->msg_ctx = msg_ctx;
 	state->endpoint = e;
-	state->dce_ctx = talloc_reference(state, dce_ctx);
+	state->dce_ctx = dce_ctx;
 	state->termination_fn = term_fn;
 	state->termination_data = term_data;
 
@@ -368,7 +368,7 @@ NTSTATUS dcesrv_setup_ncacn_ip_tcp_socket(struct tevent_context *ev_ctx,
 	state->ev_ctx = ev_ctx;
 	state->msg_ctx = msg_ctx;
 	state->endpoint = e;
-	state->dce_ctx = talloc_reference(state, dce_ctx);
+	state->dce_ctx = dce_ctx;
 	state->termination_fn = term_fn;
 	state->termination_data = term_data;
 
@@ -589,7 +589,7 @@ NTSTATUS dcesrv_setup_ncalrpc_socket(struct tevent_context *ev_ctx,
 	state->fd = -1;
 	state->ev_ctx = ev_ctx;
 	state->msg_ctx = msg_ctx;
-	state->dce_ctx = talloc_reference(state, dce_ctx);
+	state->dce_ctx = dce_ctx;
 	state->endpoint = e;
 	state->termination_fn = term_fn;
 	state->termination_data = termination_data;