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Remove nonnull attribute from isc_mem_{get,allocate,reallocate}

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The isc_mem_get(), isc_mem_allocate() and isc_mem_reallocate() can
return NULL ptr in case where the allocation size is NULL.  Remove the
nonnull attribute from the functions' declarations.

This stems from the following definition in the C11 standard:

> If the size of the space requested is zero, the behavior is
> implementation-defined: either a null pointer is returned, or the
> behavior is as if the size were some nonzero value, except that the
> returned pointer shall not be used to access an object.

In this case, we return NULL as it's easier to detect errors when
accessing pointer from zero-sized allocation which should obviously
never happen.
This commit is contained in:
Ondřej Surý
2021-07-12 09:18:12 +02:00
parent b9722ce98f
commit ce03015d48
1 changed files with 0 additions and 3 deletions
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3
lib/isc/include/isc/mem.h
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@@ -475,15 +475,12 @@ void ISCMEMFUNC(putanddetach)(isc_mem_t **, void *, size_t _ISC_MEM_FLARG);
void ISCMEMFUNC(put)(isc_mem_t *, void *, size_t _ISC_MEM_FLARG);
void ISCMEMFUNC(free)(isc_mem_t *, void *_ISC_MEM_FLARG);
ISC_ATTR_RETURNS_NONNULL
ISC_ATTR_MALLOC_DEALLOCATOR_IDX(ISCMEMFUNC(put), 2)
void *ISCMEMFUNC(get)(isc_mem_t *, size_t _ISC_MEM_FLARG);
ISC_ATTR_RETURNS_NONNULL
ISC_ATTR_MALLOC_DEALLOCATOR_IDX(ISCMEMFUNC(free), 2)
void *ISCMEMFUNC(allocate)(isc_mem_t *, size_t _ISC_MEM_FLARG);
ISC_ATTR_RETURNS_NONNULL
ISC_ATTR_DEALLOCATOR_IDX(ISCMEMFUNC(free), 2)
void *ISCMEMFUNC(reallocate)(isc_mem_t *, void *, size_t _ISC_MEM_FLARG);