Segmentation error after free (), what are the common reasons for this?

Question

I get a segmentation error after freewith a specific pointer:

free(studentDB->name);

I can get its value without any errors or warnings:

printf("[DBG] studentDB->name: %s\n", studentDB->name);

However, as I said, the program fires when I try to free it. What are the most common reasons for a team freeleading to a segmentation error?

Answer 1

If you are not malloc(), you cannot free()him. Where from studentDB->name?

Answer 2

You may have either freed () or overwritten the malloc information preceding the block with a buffer overflow

Answer 3

- . , . , , free, , .

Answer 4

free , malloc, free 'd.

, , studentDB->name.

Answer 5

studentDB->name? , , free, -! , malloc d strdup d.

, , , name...

, , , .

Answer 6

, studentDB segfault, studentDB NULL.

Answer 7

manpage:

free (ptr) ptr, malloc(), calloc() realloc(). , free (ptr) , undefined . ptr NULL, .

:

• studentDB -NULL- /, ""?
• Is the space pointed to by studentDB-> name returned malloc / calloc / realloc?