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[fetchmail]Re: fetchmail segfault on 'empty' mail

2005-12-06 04:53:39
[resending to the list, too, with more information on what I've tried to
reproduce]

Please take everything to the berlios.de lists (you'll need to
subscribe there) - we plan to leave the ccil.org lists since nobody has
administrative access to them any more.

On Mon, 05 Dec 2005, Daniel Drake wrote:

Hi,

I noticed that my fetchmail was segfaulting at the very start of a 
particular mail message, with this trace:

#0  0xb7e67423 in strlen () from /lib/tls/libc.so.6
#1  0x0805cded in readheaders (sock=6, fetchlen=0, reallen=0, 
ctl=0x808d2d8, num=2, suppress_readbody=0xbff7c835 "")
    at transact.c:920
#2  0x080597df in fetch_messages (mailserver_socket=6, ctl=0x808d2d8, 
count=272, msgsizes=0xbff7c7f0, maxfetch=0,
    fetches=0xbff7e8c0, dispatches=0xbff7e8bc, deletions=0xbff7e8cc) at 
driver.c:614
#3  0x0805ae82 in do_session (ctl=0x808d2d8, proto=0x8071da0, maxfetch=0) 
at driver.c:1449
#4  0x0805b39d in do_protocol (ctl=0x808d2d8, proto=0x8071da0) at 
driver.c:1622
#5  0x0804f81a in doPOP3 (ctl=0x808d2d8) at pop3.c:1215
#6  0x08054c11 in query_host (ctl=0x808d2d8) at fetchmail.c:1373
#7  0x08052c26 in main (argc=4, argv=0xbff80bd4) at fetchmail.c:646

It is downloading mail from POP3.

I seem to be unable to reproduce this. I've tried the POP3 modules of
Dovecot 0.99.14 and some older Courier-IMAP.

What upstream server software are you using,
who built your fetchmail version,
and what is your .fetchmailrc?

--- fetchmail-6.2.5/transact.c.orig   2005-12-05 15:25:54.000000000 +0000
+++ fetchmail-6.2.5/transact.c        2005-12-05 16:16:45.000000000 +0000
@@ -511,7 +511,7 @@ int readheaders(int sock,
          }
 
          /* check for end of headers */
-         if (end_of_header(line))
+         if (msgblk.headers && end_of_header(line))
          {
              if (linelen != strlen (line))
                  has_nuls = TRUE;

What has "msgblk.headers" got to do with "line"? I'm not particular fond
of such skewed checks, they'll come back some day to bite us.

-- 
Matthias Andree

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