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Invalid Pointer Error C


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. 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 | Success! I am getting stuck on this error from Valgrind. ==5411== Invalid free() / delete / delete[] / realloc() ==5411== at 0x402AC38: free (in /usr/lib/valgrind/vgpreload_memcheck-x86-linux.so) ==5411== by 0x804857C: main (leak.c:28) ==5411== Address http://magsuite.com/invalid-pointer/invalid-pointer.html

It could be pointing into the system stack, or the global variables, or into the program's code space, or into the operating system. Subscribed! 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. Join them; it only takes a minute: Sign up c: free() - glibc invalid pointer up vote -1 down vote favorite I am writing a bit of code, in this case

Free() Invalid Pointer C++

Look up a C++ Reference and learn How To Ask Questions The Smart Way 01-23-2009 #3 matsp View Profile View Forum Posts Kernel hacker Join Date Jul 2007 Location Farncombe, Surrey, Essentially, your vector is storing string objects by value, not pointers to string objects. Add this line before while loop: char* original = temp; and finally free(original) instead of free(temp). What you seem to want here is a: vector* vec = new vector; However, in general I don't see any compelling reason why you are allocating everything on the heap.

Generally, when new C++ programmers use heap-allocated objects and the new keyword all over the place, it is a sign that they are poorly transliterating a programming style imported from a It's quick & easy. c pointers memory-management free share|improve this question edited Jun 4 '12 at 16:15 asked Jun 1 '12 at 14:54 Alex 84211431 In your if statement, you only need to Error In Free() Invalid Pointer C++ I appreciate your answer though. –user964491 Nov 30 '13 at 7:18 @user964491 But note that the answer you accepted is wrong (as probably apparent from my comments on it)...

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 Invalid Pointer Error C++ Handlers for checkboxes to select various map features How to get last part of http link in Bash? There are reasons to store pointers to objects in a vector like this (such as the objects being actually from another container somewhere else and you need a temporary list of I've added some debug code to the source and find You are probably writing beyond the end or before the start of the allocated space.

When i put those back in. Free Invalid Pointer Glibc Detected Here's the thing - the error I get is; *** glibc detected *** /packages/R/2.15.0/lib64/R/bin/exec/R: munmap_chunk(): invalid pointer: 0x0000000014059b20 *** Now this is a pretty standard error (munmap_chunk() is part of free(), 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 semantics of that error are exactly what Arndt said.

Invalid Pointer Error C++

It doesnt matter if the rest are NULL because free(NULL) is safe. –Matt Jun 1 '12 at 14:57 How do you create the multifit_work_t struct? –Richard J. As-written your code not only attempts to delete memory it never actually allocated, it leaks what it allocations it did make. Free() Invalid Pointer C++ Thank you both for the thorough explanation; I now understand pointers and malloc much better than about a half hour ago. What Is Invalid Pointer How do we prove that something is unprovable?

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 navigate here Search Engine Optimisation provided by DragonByte SEO v2.0.32 (Pro) - vBulletin Mods & Addons Copyright © 2016 DragonByte Technologies Ltd. 418,893 Members | 1,055 Online Join Now login Ask Originally Posted by Salem You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much. Not the answer you're looking for? Free() Invalid Pointer Aborted (core Dumped)

When you're done with s altogether, you should free it, but you do not have to do that with the return values of strsep. Any ideas why/how this could happen? Calling free() on an uninitialised pointer? Check This Out Outside of your DOS world, your header file is meaningless.

The error is the assignment of the address of z to p2 since it causes the dynamically allocated memory to be "orphaned". Attempt To Free Invalid Pointer It's temporary space for things that shouldn't grow too big. Those are not individually allocated strings, but just pointers into the string s that you've already allocated.

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Wife sent to collections for ticket she paid ten years ago more hot questions question feed lang-c about us tour help blog chat data legal privacy policy work here advertising info I've added some debug code to the source and find that my pointer i get from malloc matches the one that I'm calling free with -- and there is no possibility Powering a MCU from a battery without a regulator Kiel "esperantigi" Stack Exchange? / How to "esperantize" Stack Exchange? this contact form How necessary it is to have PhD students?

How to avoid const cast for map access? Or you can modify the original string if you want (hint: char value 0 is the null terminator and tells functions like printf to stop reading the string). Not the answer you're looking for? share|improve this answer answered Nov 30 '13 at 7:04 Tim Pierce 3,819926 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using Google

I added in logging functionality to output the address and initial value for each of these arrays. The time now is 11:12 PM. You can't free a portion of the block from the inside. Browse other questions tagged c pointers memory-management free or ask your own question.

Thanks, Mike Sep 30 '07 #1 Post Reply Share this Question 3 Replies P: n/a gw7rib On 30 Sep, 21:03, Cyron * vec = new vector; vec->push_back(*(new string("1"))); vec->push_back(*(new string("2"))); for(vector::iterator itr You are adding a copy of the dynamic string you create with new and that dynamic string is lost, since you never store the pointer that new returns. Idiom for situation where you can either gain a lot or lose a lot Display a chain of little mountains with an odd number on the top of it!

share|improve this answer answered Feb 22 '13 at 19:33 Nik Bougalis 9,14411533 add a comment| up vote 3 down vote Firstly, the line vec->push_back(*(new string("1"))); is causing a memory leak. Pentest Results: Questionable CSRF Attack Examples of pairewise independent but not independent continuous random variables What to do when you are asked to perform an official review for a journal of it has come a long way since the original C++ w/STL many moons ago. You almost certainly have some kind of out-of-bounds pointer error.

Creating a game, from start to finish Recent additions How to create a shared library on Linux with GCC - December 30, 2011 Enum classes and nullptr in C++11 - Join them; it only takes a minute: Sign up C++ invalid pointer error up vote 1 down vote favorite I'm getting invalid point error from the code below I don't see Heap memory lives from when you malloc it to when you free it.