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Invalid Pointer Error In C


Not the answer you're looking for? Thanks again, I appreciate your feedback! 01-23-2009 #5 matsp View Profile View Forum Posts Kernel hacker Join Date Jul 2007 Location Farncombe, Surrey, England Posts 15,677 Note that there is a The following code is giving me an error at run time Code: #include #include int main() { int x,z; int *p; /* initialize a pointer to an integer */ I'm 100% sure its a problem with my use of the delete function, but I don't know how to fix it. http://auctusdev.com/invalid-pointer/invalid-pointer-error.html

Why is JK Rowling considered 'bad at math'? The way I am understanding this is that in the first code example, p2 is storing the the value of z in its own memory address that was allocated by malloc(). Many people have trouble with pointers. You can avoid strdup() and free() altogether by simply writing char *s = p;.

Free() Invalid Pointer C++

No new replies allowed. 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. How can I Avoid Being Frightened by the Horror Story I am Writing? 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:

Why did my electrician put metal plates wherever the stud is drilled through? Programs allocate blocks from the heap by calling the malloc function." ~Computer Systems : A Programmer's Perspective, 2nd Edition, Bryant & O'Hallaron, 2011 EDIT 2: * The C standard does not, Valgrind reports i am leaking 8 bytes. Free() Invalid Pointer Aborted (core Dumped) Are D&D PDFs sold in multiple versions of different quality?

Find the Centroid of a Polygon How to unlink (remove) the special hardlink "." created for a folder? more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed Standardisation of Time in a FTL Universe 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 http://stackoverflow.com/questions/13724142/why-do-i-get-error-invalid-pointer Thank you c malloc free glibc share|improve this question asked Feb 2 '15 at 2:07 user3314878 144 add a comment| 2 Answers 2 active oldest votes up vote 1 down vote

Do you want to help us debug the posting issues ? < is the place to report it, thanks ! Free Invalid Pointer Glibc Detected i.e char *DetectDevice(void) { char *Usbs = malloc(1024); if(Usbs != NULL) { strcpy(Usbs,"/dev/ttyUSB1"); } else { // malloc didn't allocate memory do something about it. } return Usbs; } share|improve this share|improve this answer answered Jun 1 '12 at 14:59 Matt 5,64963270 1 In this specific case this is not useful. Similar topics Help : glibc detected *** ./a.out: free(): invalid next size (normal): 0x099da890 Better free(invalid pointer) behavior?

  1. Just because something is an address doesn't mean that you need to or should free it.
  2. Why are these errors?2Freeing a pointer to a 'double' value0HTTP client with free(): invalid pointer error while freeing contents of char **0Error while freeing a malloc'd pointer1munmap_chunk(): invalid pointer error Hot
  3. if(close(fd) == -1) { printf("Error Closing Port"); }else { printf("whihi!"); free(PathToDevice); } return 0; } char *DetectDevice(void) { char *Usbs = malloc(1024); Usbs = "/dev/ttyUSB1"; return Usbs; } Error Message: *
  4. Otherwise, your program might appear to work now and puzzlingly fail later.
  5. The time now is 09:56 PM.
  6. Are you perhaps writing to memory just outside the memory you have allocated?
  7. 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
  8. thanks a lot.

Free Invalid Pointer In C

So the same is returned and pointed by your pointer PathToDevice and now you are trying to free it, so you are getting this kind of error message. try here You should use strcpy(Usbs,"/dev/ttyUSB1") and then return Usbs. Free() Invalid Pointer C++ Meaning of grey and yellow/brown colors of buildings in google maps? What Is Invalid Pointer In it, you'll get: The week's top questions and answers Important community announcements Questions that need answers see an example newsletter By subscribing, you agree to the privacy policy and terms

I'm running it on a cluster, if that makes any difference. weblink Specific word to describe someone who is so good that isn't even considered in say a classification Hit a curb; chewed up rim and took a chunk out of tire. Not the answer you're looking for? 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)... Error In Free() Invalid Pointer C++

Any ideas why/how this could happen? 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. 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 navigate here So you'll probably see a lot of addresses ending at 0x....0, 0x....8, 0x....10, 0x....18, 0x....20 etc.

Either you have done 'delete' on something which was not an object, or something else has happened that has corrupted the memory structure, like writing outside an array. Attempt To Free Invalid Pointer Please don't PM me for help - and no, I don't do help over instant messengers. 01-23-2009 #4 skreaminskull View Profile View Forum Posts Registered User Join Date Jan 2009 Posts When i put those back in.

When the value of z changes from 7 to 8, p2 remains at 7 because it was only assigned the value of z at the time of assignment and does not

The use of each key in Western music Want to make things right, don't know with whom Are non-english speakers better protected from (international) Phishing? Most have more sense than to send me hundreds of lines of code. asked 4 years ago viewed 7602 times active 4 years ago Blog Stack Overflow Podcast #91 - Can You Stump Nick Craver? Invalid Pointer Windows 7 Login Those pointers are stored in the heap, so we might be seeing pointer corruption from some out of bounds access to your arrays.

Powered by vBulletin Version 4.2.3 Copyright © 2016 vBulletin Solutions, Inc. Originally Posted by Adak io.h certainly IS included in some modern compilers. When i take out the free(token) and free(tk). his comment is here Are non-english speakers better protected from (international) Phishing?

Right, I was trying to get p2 to be a pointer to z and get in some practice with malloc. and try to free. Use char *DetectDevice(void) { char *Usbs = malloc(1024); strcpy(Usbs, "/dev/ttyUSB1"); return Usbs; } to copy the string, or char *DetectDevice(void) { return strdup("/dev/ttyUSB1"); } to allocate the string with just the That part confuses yet more people.

Alternatively, you could also recognise that DetectDevice returns a read-only string const char *DetectDevice(void) { return "/dev/ttyUSB1"; } and remove the free from calling code instead. Last edited by Arndt; June 19th, 2007 at 11:32 AM. How to know if a meal was cooked with or contains alcohol? Moreover, you cannot free a pointer twice.

When you have in fact allocated a block of memory, you can only free it from the pointer returned by malloc. 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. Are QA responsible for xml schema validation testing Microcontroller hangs while switching off When is it okay to exceed the absolute maximum rating on a part? UPDATED 1 multifit_work_t is created through the following; typedef struct { int m,n; double *w,*u,*v,*b,*rv1; } multifit_work_t; multifit_work_t *alloc_multifit(int m, int n) { multifit_work_t *work=(multifit_work_t *)malloc(sizeof(multifit_work_t)); if (work==NULL) { fprintf(stderr,"failed to

You can't free a portion of the block from the inside. There are two main types of memory you seem to be confusing - stack memory and heap memory. Linked 4 segmentation fault when free() is used Related 31Why is scanf() causing infinite loop in this code?0Returning string pointer from a function: Error1647Why doesn't GCC optimize a*a*a*a*a*a to (a*a*a)*(a*a*a)?5Why do Why did Moody eat the school's sausages?

Try running your code under valgrind. –Paul R Jun 1 '12 at 14:59 Maybe it's a double-free? 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 -