Examples of using Malloc in English and their translations into Russian
{-}
-
Official
-
Colloquial
Let's modify our previous code to work with malloc.
Malloc accepts a size request without checking its plausibility;
This is the 6th part, which focuses on the malloc function.
If the malloc function is unable to allocate the memory buffer, it returns NULL.
But I'm not going to write the extra checks after each malloc.
People also translate
Malloc calls upon the operating system to obtain more memory as necessary.
In C++, this allocation is usually performed by the malloc function or new operator.
If the malloc function failed to allocate memory, it is unlikely that my program will continue to function properly.
However, the found defects will be enough for us to discuss the malloc function.
Among them are the following: malloc, realloc, fopen, isalpha, atof, strcmp and many, many others.
Memory is allocated only for unexpectedly large strings. This is done with malloc() and free().
I hope now you have a new look at the malloc function, check pointers and warnings of the PVS-Studio code analyzer.
He argues that they understand what they are doing when they don't check the result of the malloc function call.
In this respect an anonymous mapping is similar to malloc, and is used in some malloc(3) implementations for certain allocations.
By the way, there is another excuse for developers,why they don't check what the malloc function returned.
Now the analyzer thinks that the malloc function cannot return NULL and, therefore, will not issue the V522 warning for the following code.
As the header file"stdlib.h" is disabled, the C compiler considers that malloc function will return int type.
The version that we will now write is unrestricted. Calls to malloc andfree may occur in any order; malloc calls upon the operating system to obtain more memory as necessary.
The only way to write reliable andcorrect code is to always check the result that is returned by the malloc function.
Rather than allocating from a compiled-in fixed-size array, malloc will request space from the operating system as needed.
The analyzer detected a potential error relating to using a dangerous expression serving as an actual argument for malloc function.
Any normal program should check the pointers which the malloc function returns and properly handle the situation when the memory allocation failed.
Sometimes you may want to change the analyzer's behavior and make it think,for example, that malloc cannot return NULL.
The canonical heap overflow technique overwrites dynamic memory allocation linkage(such as malloc meta data) and uses the resulting pointer exchange to overwrite a program function pointer.
This issue may enable a hostile hidden service to crash Tor clients depending on hardening options and malloc implementation.
Dawid Golunski discovered that the mysqld_safe wrapper provided by the MySQL database server insufficiently restricted the load path for custom malloc implementations, which could result in privilege escalation.
Write a routine bfree(p, n)that will free any arbitrary block p of n characters into the free list maintained by malloc and free.
Since other activities in the program may also request space without calling this allocator,the space that malloc manages may not be contiguous.
I'm not making this up, I have talked with people who consider this approach to be appropriate andconsciously never check the result that the malloc function returns.
The analyzer has detected a potential error caused by using one of the dynamic memory allocation functions such as malloc, calloc, realloc.