Date: Mon, 19 Apr 2004 00:05:20 -0400 From: Kaarthik Sivakumar <kaarthik@comcast.net> To: ports@freebsd.org, krion@FreeBSD.org Subject: devel/libidn: warning when freeing memory Message-ID: <86u0zgipdr.fsf@comcast.net>
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When idn is run, it prints the following message for any string given to it: idn in free(): error: junk pointer, too high to make sense After setting MALLOC_OPTIONS to A and compiling libidn with '-g', I got the following backtrace: ,---- | (gdb) run | Starting program: /usr/home/programs/libidn-0.4.2/src/.libs/idn | libidn 0.4.2 | Copyright 2002, 2003, 2004 Simon Josefsson. | GNU Libidn comes with NO WARRANTY, to the extent permitted by law. | You may redistribute copies of GNU Libidn under the terms of | the GNU Lesser General Public License. For more information | about these matters, see the file named COPYING.LIB. | Type each input string on a line by itself, terminated by a newline character. | test this string | idn in free(): error: junk pointer, too high to make sense | | Program received signal SIGABRT, Aborted. | 0x281f1d4f in kill () from /lib/libc.so.5 | (gdb) bt | #0 0x281f1d4f in kill () from /lib/libc.so.5 | #1 0x281e67f8 in raise () from /lib/libc.so.5 | #2 0x2825ef02 in abort () from /lib/libc.so.5 | #3 0x2825d67e in tcflow () from /lib/libc.so.5 | #4 0x2825d6ab in tcflow () from /lib/libc.so.5 | #5 0x2825e1d8 in tcflow () from /lib/libc.so.5 | #6 0x2825e420 in free () from /lib/libc.so.5 | #7 0x08049c1f in main (argc=1, argv=0xbfbfe9f0) at idn.c:381 | #8 0x08048c62 in _start () | (gdb) fr 7 | #7 0x08049c1f in main (argc=1, argv=0xbfbfe9f0) at idn.c:381 | 381 free (r); | (gdb) l | 376 argv[0], rc); | 377 free (q); | 378 return 1; | 379 } | 380 | 381 free (r); | 382 } | 383 #endif | 384 | 385 if (args_info.debug_given) | (gdb) p r | $1 = 0x6f732e <Error reading address 0x6f732e: Bad address> | (gdb) `---- I tried debugging but I couldnt figure out what was wrong. The address seems low for stack addresses, but it is obviously high for a heap address. Thanks kaarthik
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