[Pidgin] #17375: "Segmentation Fault" on IRC server reply

[Pidgin]

#17375: "Segmentation Fault" on IRC server reply
---------------------+-----------------
 Reporter:  villain  |      Owner:  elb
     Type:  defect   |     Status:  new
Milestone:           |  Component:  IRC
  Version:  2.12.0   |   Keywords:
---------------------+-----------------
 version: Pidgin 2.12.0 (libpurple 2.12.0)

 OS: Ubuntu 18.04

 The problem:

 Pidgin works correctly if server sends ":nick!user at host JOIN #channel",
 but it crashes with "Segmentation Fault" if server sends ":nick JOIN
 #channel".

 Other IRC clients (hexchat, weechat) handle this message correctly and
 don't crash.


 {{{
 Core was generated by `pidgin -d'.
 Program terminated with signal SIGSEGV, Segmentation fault.
 #0  __strlen_avx2 () at ../sysdeps/x86_64/multiarch/strlen-avx2.S:62
 62      ../sysdeps/x86_64/multiarch/strlen-avx2.S: No such file or
 directory.
 [Current thread is 1 (Thread 0x7fc7f66f4f00 (LWP 14865))]
 (gdb) bt full
 #0  __strlen_avx2 () at ../sysdeps/x86_64/multiarch/strlen-avx2.S:62
 No locals.
 #1  0x00007fc7f3c7c3a3 in g_strdup () from /usr/lib/x86_64-linux-
 gnu/libglib-2.0.so.0
 No symbol table info available.
 #2  0x00007fc7e22b3f8b in irc_mask_userhost (mask=0x555e6f38a8f0 "crash")
 at ././libpurple/protocols/irc/msgs.c:74
 No locals.
 #3  irc_msg_join (irc=0x555e6ff9f5d0, name=<optimized out>,
 from=0x555e6f38a8f0 "crash", args=0x555e7010c5b0) at
 ././libpurple/protocols/irc/msgs.c:993
         gc = <optimized out>
         convo = 0x555e6f775b90
         chat = <optimized out>
         cb = <optimized out>
         nick = 0x555e700a9450 "crash"
         userhost = <optimized out>
         buf = <optimized out>
         ib = <optimized out>
         id = 3
         __func__ = "irc_msg_join"
 #4  0x00007fc7e22b6cfb in irc_parse_msg (irc=irc at entry=0x555e6ff9f5d0,
 input=<optimized out>, input at entry=0x555e6ff744e0 ":crash JOIN #contacts")
 at ././libpurple/protocols/irc/parse.c:778
         msgent = 0x7fc7e24bdf60 <_irc_msgs+1856>
         cur = <optimized out>
         end = <optimized out>
         tmp = 0x555e6f38a8f0 "crash"
         from = 0x555e6f68de00 "crash"
         msgname = <optimized out>
         fmt = 0x7fc7e22b8479 ":"
         args = 0x555e7010c5b0
         msg = <optimized out>
         i = <optimized out>
         gc = <optimized out>
         fmt_valid = <optimized out>
         args_cnt = <optimized out>
 #5  0x00007fc7e22afd42 in read_input (irc=0x555e6ff9f5d0, len=<optimized
 out>) at ././libpurple/protocols/irc/irc.c:660
         step = <optimized out>
         cur = 0x555e6ff744e0 ":crash JOIN #contacts"
         end = 0x555e6ff744f5 ""
 #6  0x0000555e6e1f755e in pidgin_io_invoke (source=<optimized out>,
 condition=<optimized out>, data=0x555e6ffa17b0) at
 ././pidgin/gtkeventloop.c:73
         closure = 0x555e6ffa17b0
         purple_cond = PURPLE_INPUT_READ
 #7  0x00007fc7f3c5d1f5 in g_main_context_dispatch () from /usr/lib/x86_64
 -linux-gnu/libglib-2.0.so.0
 No symbol table info available.
 #8  0x00007fc7f3c5d5c0 in ?? () from /usr/lib/x86_64-linux-
 gnu/libglib-2.0.so.0
 No symbol table info available.
 #9  0x00007fc7f3c5d8d2 in g_main_loop_run () from /usr/lib/x86_64-linux-
 gnu/libglib-2.0.so.0
 No symbol table info available.
 #10 0x00007fc7f4f13a37 in gtk_main () from /usr/lib/x86_64-linux-
 gnu/libgtk-x11-2.0.so.0
 No symbol table info available.
 #11 0x0000555e6e1bd8a3 in main (argc=<optimized out>, argv=<optimized
 out>) at ././pidgin/gtkmain.c:938
         opt_force_online = 0
         opt_help = <optimized out>
         opt_login = 0
         opt_nologin = 0
         opt_version = <optimized out>
         opt_si = <optimized out>
         opt_config_dir_arg = <optimized out>
         opt_login_arg = <optimized out>
         opt_session_arg = <optimized out>
         search_path = <optimized out>
         accounts = <optimized out>
         sig_indx = 1
         sigset = {__val = {90118, 0 <repeats 15 times>}}
         errmsg = '\000' <repeats 601 times>...
         signal_channel = <optimized out>
         signal_status = <optimized out>
         signal_channel_watcher = 1
         segfault_message_tmp = <optimized out>
         error = 0x0
         opt = <optimized out>
         gui_check = <optimized out>
         debug_enabled = <optimized out>
         migration_failed = 0
         active_accounts = <optimized out>
         long_options = {{name = 0x555e6e25a851 "config", has_arg = 1, flag
 = 0x0, val = 99}, {name = 0x555e6e248b79 "debug", has_arg = 0, flag = 0x0,
 val = 100}, {name = 0x555e6e2567e2 "force-online", has_arg = 0, flag =
 0x0, val = 102}, {name = 0x555e6e24a69b "help",
             has_arg = 0, flag = 0x0, val = 104}, {name = 0x555e6e25668e
 "login", has_arg = 2, flag = 0x0, val = 108}, {name = 0x555e6e2567ef
 "multiple", has_arg = 0, flag = 0x0, val = 109}, {name = 0x555e6e2567f8
 "nologin", has_arg = 0, flag = 0x0, val = 110}, {
             name = 0x555e6e25a847 "session", has_arg = 1, flag = 0x0, val
 = 115}, {name = 0x555e6e24cebd "version", has_arg = 0, flag = 0x0, val =
 118}, {name = 0x555e6e25a85a "display", has_arg = 1, flag = 0x0, val =
 68}, {name = 0x555e6e25731a "sync", has_arg = 0,
             flag = 0x0, val = 83}, {name = 0x0, has_arg = 0, flag = 0x0,
 val = 0}}

 }}}

--
Ticket URL: <https://developer.pidgin.im/ticket/17375>
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