Valgrind error Post: 302428705

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Top Forums Programming Valgrind error Post 302428705 by cyler on Thursday 10th of June 2010 02:36:14 PM

06-10-2010

Registered User

Valgrind error

I get this Valgrind error while using malloc but if I use calloc then there is no error.

I allocate 8 bytes for the string inside sprintf, 12 for the ip and 1 for the string terminator. This totals 21, so why is it talking about 20 bytes and 18 bytes ?

Quote:

==10228== Syscall param socketcall.sendto(msg) points to uninitialised byte(s)
==10228== at 0x4EF65B5: send (in /lib/libc-2.7.so)
==10228== by 0x4030B4: functionname (includefile.h:249)
==10228== by 0x403976: main (program.c:28)
==10228== Address 0x517d89a is 18 bytes inside a block of size 20 alloc'd
==10228== at 0x4C2260E: malloc (vg_replace_malloc.c:207)
==10228== by 0x40307C: functionname (includefile.h:247)
==10228== by 0x403976: main (program.c:28)

Partial code:

Code:

char ip[] = "80.80.80.80";
int buffer = 8 + strlen(ip); // 8 for headers fixed text
char *headers = malloc(buffer + 1);
sprintf(headers, " -r %s\r\n", ip);
send(foobar, headers, buffer, 0);

cyler

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test::valgrind::action::captor

Test::Valgrind::Action::Captor(3pm)			User Contributed Perl Documentation		       Test::Valgrind::Action::Captor(3pm)

NAME

       Test::Valgrind::Action::Captor - Mock Test::Valgrind::Action for capturing output.

VERSION

       Version 1.13

DESCRIPTION

       This class provides helpers for saving, redirecting and restoring filehandles.

       It's not meant to be used directly as an action.

METHODS

   "new"
       Just a croaking stub to remind you not to use this class as a real action.

   "save_fh $from, $mode [, $to ]"
       Save the original filehandle $from opened with mode $mode, and redirect it to $to if it's defined or to /dev/null otherwise.

   "restore_all_fh"
       Restore all the filehandles that were saved with "save_fh" to their original state.

       The redirections aren't closed.

SEE ALSO

       Test::Valgrind, Test::Valgrind::Action.

       Capture::Tiny.

AUTHOR

       Vincent Pit, "<perl at profvince.com>", <http://www.profvince.com>.

       You can contact me by mail or on "irc.perl.org" (vincent).

BUGS

       Please report any bugs or feature requests to "bug-test-valgrind at rt.cpan.org", or through the web interface at
       http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Test-Valgrind <http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Test-Valgrind>.  I will be
       notified, and then you'll automatically be notified of progress on your bug as I make changes.

SUPPORT

       You can find documentation for this module with the perldoc command.

	   perldoc Test::Valgrind::Action::Captor

COPYRIGHT &; LICENSE
       Copyright 2009,2010,2011 Vincent Pit, all rights reserved.

       This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

perl v5.12.4							    2011-08-25				       Test::Valgrind::Action::Captor(3pm)