Wietse Venema via Postfix-devel:
> > There is an unnecessary double check of the "addr_list" pointer for null
>
> (twice). It does no harm, and a good compiler will remove that test.
> Generally, I don't worry about repeated tests like this. They make
> Postfix code a bit easier to maintain, because there are fewer
> implicit dependencies.
>
> > In posttls-finger there are problems with using "service" char pointer in
> > logging. I initialized the variable
> > to null and ensured that it does not point into already freed space.
>
> Yeah, that is the result of clumsy memory management and should be fixed.
>
> I'll try to make this more obviously correct without adding multiple
> instances of "if (bah != 0) myfree(bah);" throughout the code,
> because it's too easy to forget adding another instance when the
> code is updated.
I simplified the code as with patch below. This 1) fixes the warning
message when the destination in "dest" contains ":service" information,
and 2) limits the visibility of some temporary variables.
Wietse
20230517
Bugfix (defect introduced: Postfix 3.8) the posttls-finger
command could access uninitialized memory when reconnecting.
Reported by Thomas Korbar. File: posttls-finger/posttls-finger.c.
diff '--exclude=man' '--exclude=html' '--exclude=README_FILES'
'--exclude=INSTALL' '--exclude=.indent.pro' -r -ur
/var/tmp/postfix-3.9-20230516/src/posttls-finger/posttls-finger.c
./src/posttls-finger/posttls-finger.c
--- /var/tmp/postfix-3.9-20230516/src/posttls-finger/posttls-finger.c
2023-04-13 10:16:06.000000000 -0400
+++ ./src/posttls-finger/posttls-finger.c 2023-05-16 13:46:27.593011475
-0400
@@ -1590,12 +1590,13 @@
static void connect_remote(STATE *state, char *dest)
{
DNS_RR *addr;
- char *buf;
- char *domain;
- char *service;
/* When reconnecting use IP address of previous session */
if (state->addr == 0) {
+ char *buf;
+ char *domain;
+ char *service;
+
buf = parse_destination(dest, state->smtp ? "smtp" : "24",
&domain, &service, &state->port);
if (!state->nexthop)
@@ -1622,8 +1623,8 @@
if (level == TLS_LEV_INVALID
|| (state->stream = connect_addr(state, addr)) == 0) {
- msg_info("Failed to establish session to %s:%s via %s:%u: %s",
- dest, service, HNAME(addr), addr->port,
+ msg_info("Failed to establish session to %s via %s:%u: %s",
+ dest, HNAME(addr), addr->port,
vstring_str(state->why->reason));
continue;
}
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