Home > Invalid Pointer > Invalid Pointer C

Invalid Pointer C

Contents

You're trying to free the inside of a block of memory. Join them; it only takes a minute: Sign up glibc detected free() invalid pointer up vote 2 down vote favorite I'm having a bit of trouble with some dynamic memory allocation. EDIT 2 typedef struct { char ** FileNames; int ** Results; int NumOfItems; }WorkItem; typedef struct QI{ WorkItem * workItem; struct QI * NextItem; }QueueItem; typedef struct { QueueItem * Head, You don't. have a peek here

c malloc free dynamic-memory-allocation share|improve this question asked Sep 5 '15 at 17:21 Connal Sumlin 265 Note - you should always check return of malloc . –ameyCU Sep 5 If you are just starting to program in general, you might want to avoid pointers all together until you are are comfortable with the basics. Should I list "boredom" as a reason for leaving my previous job in an interview? share|improve this answer answered Nov 12 '13 at 22:39 ouah 107k11152236 I am?

Free() Invalid Pointer C++

Why don't quaternions contradict the Fundamental Theorem of Algebra? Since free expects to see some data before the pointer you pass in, that holds a bit of data to so that free can do it's job, this is not the asked 1 year ago viewed 389 times active 1 year ago Get the weekly newsletter! OTOH, on these systems, we could enhance the definition of "heap" to mean the memory area where malloc() takes its memory from, and all is fine again. –glglgl Nov 30 '13

Try running your code under valgrind. –Paul R Jun 1 '12 at 14:59 Maybe it's a double-free? share|improve this answer edited Nov 30 '13 at 7:06 answered Nov 30 '13 at 7:01 user529758 That worked. By using strlen(ptr) you basically don't use any limit and you can find the problem you are trying to avoid, if strlen(ptr) > 64 you overflow over the length of tokens[i] Free Invalid Pointer Glibc Detected Is it a Linearized Tree? (Breadth-first Edition) Adding variable text to text file by line Is it possible to apply for a Schengen visa from Germany after one to Switzerland was

asked 1 year ago viewed 951 times active 1 year ago Visit Chat Related 293What REALLY happens when you don't free after malloc?0Help with malloc and free: Glibc detected: free(): invalid Error In Free() Invalid Pointer C++ Thanks in advance for your time! 01-23-2009 #2 laserlight View Profile View Forum Posts Visit Homepage C++ Witch Join Date Oct 2003 Location Singapore Posts 25,495 Let's concentrate on those statements Not the answer you're looking for? Hiccup a string Goldstone modes and Anderson-Higgs mechanism in the context of BCS theory Ebleco, eblo aŭ eblaĵo?

The pointer p will then become uninitialized as well, and any reference to *p is an invalid pointer reference. Invalid Pointer Error In C Also, would changing the 2nd bit of code to tokens[i] = calloc(strlen(ptr),sizeof(char)); strncpy(tokens[i], ptr, strlen(ptr)); be beneficial? Coding standard for clarity: comment every line of code? My kids watch Youtube, how to monitor what they see?

Error In Free() Invalid Pointer C++

share|improve this answer answered Sep 5 '15 at 17:27 TimLayne 749 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using Google Sign Below is just a test code that I've been playing around with to try and fix the problem (it's the same problem in my current project's code, this is just a Free() Invalid Pointer C++ someone can explain me why? What Is Invalid Pointer Why is pattern "command || true" useful?

When i put those back in. navigate here Bug #2 - Invalid Pointer References An invalid pointer reference occurs when a pointer's value is referenced even though the pointer doesn't point to a valid block. Testing this long verbose error message to check the behaviour More From The Stuff Network BrainStuff CarStuff Stuff Mom Never Told You Stuff of Genius Stuff They Don't Want You to The best way to do that is to draw pictures of the code's execution step by step. 1 2 … 24 25 26 27 28 … 40 41 NEXT Print | Free() Invalid Pointer Aborted (core Dumped)

Operation 194699 is in the last set of values I get before the segfault; Calling free_multifit... 194696) work->u: ADDRESS: [0x1305f7d0] VALUE: [1.350474e+01] 194697) work->w: ADDRESS: [0x92ec810] VALUE: [1.350474e+01] 194698) work->v: ADDRESS: Originally Posted by Bjarne Stroustrup (2000-10-14) I get maybe two dozen requests for help with some sort of programming or design problem every day. share|improve this answer edited Jun 1 '12 at 19:27 answered Jun 1 '12 at 19:16 Jis Ben 12517 add a comment| up vote 0 down vote accepted Somewhere, deep, deep, in http://magsuite.com/invalid-pointer/invalid-pointer.html share|improve this answer answered Sep 5 '15 at 17:29 Jack 91.7k21142253 Very helpful, thank you!

The only way to avoid this bug is to draw pictures of each step of the program and make sure that all pointers point somewhere. Attempt To Free Invalid Pointer Thanks again for the noting that difference... 01-23-2009 #7 Elysia View Profile View Forum Posts C++まいる!Cをこわせ! Join Date Oct 2007 Location Inside my computer Posts 24,580 *applaud* Well done. Creating color coded playing instruction for xylophones C++ - Error with ranged for inside function Could there ever be a fully solar powered airliner capable of transatlantic flights?

Linked 1429 Do I cast the result of malloc?

Handlers for checkboxes to select various map features Missing text element in a formula How can I create a sophisticated table like the one attached? Any ideas why/how this could happen? Because WPA 2 is compromised, is there any other security protocol for Wi-Fi? Invalid Pointer Windows 7 Login Cyclopentadienyl radical geometry and MO considerations Factorial digit sum Is it possible to apply for a Schengen visa from Germany after one to Switzerland was refused?

more hot questions question feed lang-c about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback Technology Life / Arts Culture / Recreation For your bit of code here, you probably want to find a way to copy relevant portion of memory to somewhere else...say another block of memory you've set aside. UPDATE 3 Below is the valgrind report valgrind --leak-check=full --show-reachable=yes ./execute ==23072== Memcheck, a memory error detector ==23072== Copyright (C) 2002-2010, and GNU GPL'd, by Julian Seward et al. ==23072== Using this contact form You must watch your code so that these bugs do not occur.

asked 4 years ago viewed 22387 times active 4 years ago Get the weekly newsletter! What would cause turkeys to be intelligent? How to sample points randomly below a curve? Idiom for situation where you can either gain a lot or lose a lot How to Rotate and translate a figure?

How do we prove that something is unprovable?