3party/libzmq
0
0
Fork 0
mirror of https://github.com/zeromq/libzmq.git synced 2024-12-26 23:01:04 +08:00
Code Issues Projects Releases Wiki Activity

Do not break if malloc size is zero

Browse Source 
I get a scenario where `size_` is `0` so there is nothing to `malloc()`.

According to `malloc(3)`:

If size is 0, then malloc() returns either NULL, or a unique pointer value thatcan later be
success‐fully passed to free().

According to `free(3)`:

If ptr is NULL, no operation is performed.

So, if `size_` is null and `_data` also, there is no OOM error.

We can adjust the assert to not fail on this scenario.
This commit is contained in:
Marco Casaroli 2023-01-31 14:36:56 +01:00
parent f049edbf12
commit d16db180d3
1 changed files with 13 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
src/blob.hpp
View File

@ -81,7 +81,7 @@ struct blob_t
_size (size_),
_owned (true)
{
alloc_assert (_data);
alloc_assert (!_size || _data);
}
// Creates a blob_t of a given size, an initializes content by copying
@ -91,8 +91,10 @@ struct blob_t
_size (size_),
_owned (true)
{
alloc_assert (_data);
memcpy (_data, data_, size_);
alloc_assert (!size_ || _data);
if (size_ && _data) {
memcpy (_data, data_, size_);
}
}
// Creates a blob_t for temporary use that only references a
@ -126,10 +128,12 @@ struct blob_t
{
clear ();
_data = static_cast<unsigned char *> (malloc (other_._size));
alloc_assert (_data);
alloc_assert (!other_._size || _data);
_size = other_._size;
_owned = true;
memcpy (_data, other_._data, _size);
if (_size && _data) {
memcpy (_data, other_._data, _size);
}
}
// Sets a blob_t to a copy of a given buffer.
@ -137,10 +141,12 @@ struct blob_t
{
clear ();
_data = static_cast<unsigned char *> (malloc (size_));
alloc_assert (_data);
alloc_assert (!size_ || _data);
_size = size_;
_owned = true;
memcpy (_data, data_, size_);
if (size_ && _data) {
memcpy (_data, data_, size_);
}
}
// Empties a blob_t.