segfault in xfer_backport_seen() when doing an XFER from 2.4.x to 2.3.x

[brong]

From: Dave McMurtrie
Bugzilla-Id: 3371
Version: 2.4.x (next)
Owner: Bron Gondwana

[brong]

From: Dave McMurtrie

Program terminated with signal 11, Segmentation fault.
#0 xfer_backport_seen (tag=0x1d498d50 "5", name=<value optimized out>,
toserver=<value optimized out>, topart=0x1d4abbfa "u1") at imapd.c:8522
8522 struct seqset *outlist = seqset_init(mailbox->i.last_uid, SEQ_MERGE);
(gdb) where
#0 xfer_backport_seen (tag=0x1d498d50 "5", name=<value optimized out>,
toserver=<value optimized out>, topart=0x1d4abbfa "u1") at imapd.c:8522
#1 cmd_xfer (tag=0x1d498d50 "5", name=<value optimized out>,
toserver=<value optimized out>, topart=0x1d4abbfa "u1") at imapd.c:8918
#2 0x0000000000411494 in cmd_rename (tag=0x1d498d50 "5",
oldname=0x1d499570 "user.dave64", newname=0x1d4ab7d0 "user.dave64",
partition=0x0) at imapd.c:5516
#3 0x000000000041a3f9 in cmdloop () at imapd.c:1690
#4 0x000000000041c2a5 in service_main (argc=<value optimized out>,
argv=<value optimized out>, envp=<value optimized out>) at imapd.c:941
#5 0x000000000040702d in main (argc=<value optimized out>,
argv=<value optimized out>, envp=0x7fff0918f4e8) at service.c:581

[brong]

From: Bron Gondwana

I think this one already got resolved in the previous release, but it's definitely fixed anyway.