ExFreePool function (wdm.h)
The ExFreePool routine deallocates a block of pool memory.
Syntax
void ExFreePool(
[in] PVOID P
);
Parameters
[in] P
Specifies the address of the block of pool memory being deallocated.
Return value
None
Remarks
This routine releases memory allocated by ExAllocatePool, ExAllocatePoolWithTag, ExAllocatePoolWithQuota, or ExAllocatePoolWithQuotaTag. The memory block must not be accessed after it is freed.
Drivers can also use the ExFreePoolWithTag routine to free buffers allocated by ExAllocatePoolWithTag and ExAllocatePoolWithQuotaTag.
Callers of ExFreePool must be running at IRQL <= DISPATCH_LEVEL. A caller at DISPATCH_LEVEL must have specified a NonPagedXxxPoolType when the memory was allocated. Otherwise, the caller must be running at IRQL <= APC_LEVEL.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Available starting with Windows 2000. |
| Target Platform | Universal |
| Header | wdm.h (include Wdm.h, Ntddk.h, Ntifs.h) |
| Library | NtosKrnl.lib |
| DLL | NtosKrnl.exe |
| IRQL | <= DISPATCH_LEVEL (see Remarks section) |
| DDI compliance rules | DoubleExFreePool(storport) |