s3:winbind: Use a stackframe and cleanup when leaving

BUG: https://bugzilla.samba.org/show_bug.cgi?id=13209

Signed-off-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>

diff --git a/source3/winbindd/winbindd_pam.c b/source3/winbindd/winbindd_pam.c
index c7d2ca434fc9c288690321bb63573ba0b6b8532f..01d08c1e2b398b65350f141ee1a38ed839922dc8 100644 (file)
--- a/source3/winbindd/winbindd_pam.c
+++ b/source3/winbindd/winbindd_pam.c
@@ -56,16 +56,17 @@ static NTSTATUS append_info3_as_txt(TALLOC_CTX *mem_ctx,
                                    union netr_Validation *validation)
 {
        struct netr_SamInfo3 *info3 = NULL;
-       char *ex;
+       char *ex = NULL;
        uint32_t i;
-       NTSTATUS status;
+       NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
+       TALLOC_CTX *frame = talloc_stackframe();
 
-       status = map_validation_to_info3(talloc_tos(),
+       status = map_validation_to_info3(frame,
                                         validation_level,
                                         validation,
                                         &info3);
        if (!NT_STATUS_IS_OK(status)) {
-               return status;
+               goto out;
        }
 
        resp->data.auth.info3.logon_time =
@@ -120,10 +121,10 @@ static NTSTATUS append_info3_as_txt(TALLOC_CTX *mem_ctx,
                        validation->sam6->principal_name.string);
        }
 
-       ex = talloc_strdup(mem_ctx, "");
+       ex = talloc_strdup(frame, "");
        if (ex == NULL) {
-               TALLOC_FREE(info3);
-               return NT_STATUS_NO_MEMORY;
+               status = NT_STATUS_NO_MEMORY;
+               goto out;
        }
 
        for (i=0; i < info3->base.groups.count; i++) {
@@ -131,36 +132,36 @@ static NTSTATUS append_info3_as_txt(TALLOC_CTX *mem_ctx,
                                                   info3->base.groups.rids[i].rid,
                                                   info3->base.groups.rids[i].attributes);
                if (ex == NULL) {
-                       TALLOC_FREE(info3);
-                       return NT_STATUS_NO_MEMORY;
+                       status = NT_STATUS_NO_MEMORY;
+                       goto out;
                }
        }
 
        for (i=0; i < info3->sidcount; i++) {
                char *sid;
 
-               sid = dom_sid_string(mem_ctx, info3->sids[i].sid);
+               sid = dom_sid_string(frame, info3->sids[i].sid);
                if (sid == NULL) {
-                       TALLOC_FREE(info3);
-                       return NT_STATUS_NO_MEMORY;
+                       status = NT_STATUS_NO_MEMORY;
+                       goto out;
                }
 
                ex = talloc_asprintf_append_buffer(ex, "%s:0x%08X\n",
                                                   sid,
                                                   info3->sids[i].attributes);
                if (ex == NULL) {
-                       TALLOC_FREE(info3);
-                       return NT_STATUS_NO_MEMORY;
+                       status = NT_STATUS_NO_MEMORY;
+                       goto out;
                }
-
-               talloc_free(sid);
        }
 
-       resp->extra_data.data = ex;
        resp->length += talloc_get_size(ex);
+       resp->extra_data.data = talloc_move(mem_ctx, &ex);
 
-       TALLOC_FREE(info3);
-       return NT_STATUS_OK;
+       status = NT_STATUS_OK;
+out:
+       TALLOC_FREE(frame);
+       return status;
 }
 
 static NTSTATUS append_info3_as_ndr(TALLOC_CTX *mem_ctx,