Fix bad use of library, copying string over itself

[exim.git] / src / src / deliver.c

diff --git a/src/src/deliver.c b/src/src/deliver.c
index 6c6e6f7d12ef8a03dec8e483e9f7aeabc3b8f666..4624719f853ed84c9ae462dddd123bd3fe452c95 100644 (file)
--- a/src/src/deliver.c
+++ b/src/src/deliver.c
@@ -5586,7 +5586,8 @@ message size. This use of strcpy() is OK because the length id is checked when
 it is obtained from a command line (the -M or -q options), and otherwise it is
 known to be a valid message id. */
 
-Ustrcpy(message_id, id);
+if (id != message_id)
+  Ustrcpy(message_id, id);
 f.deliver_force = forced;
 return_count = 0;
 message_size = 0;