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ArmPkg/ArmDmaLib: deal with NULL return value of UncachedAllocatePages () 

The allocation function UncachedAllocatePages () may return NULL, in
which case our implementation of DmaAllocateBuffer () should return
EFI_OUT_OF_RESOURCES rather than silently ignoring the NULL value and
returning EFI_SUCCESS.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>
This commit is contained in:
Ard Biesheuvel 2016-04-19 16:12:10 +02:00
parent 9c0dc0b01a
commit e55f8c73b6
1 changed files with 10 additions and 2 deletions
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12
ArmPkg/Library/ArmDmaLib/ArmDmaLib.c
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@ -216,6 +216,8 @@ DmaAllocateBuffer (
OUT VOID **HostAddress
)
{
VOID *Allocation;
if (HostAddress == NULL) {
return EFI_INVALID_PARAMETER;
}
@ -226,13 +228,19 @@ DmaAllocateBuffer (
// We used uncached memory to keep coherency
//
if (MemoryType == EfiBootServicesData) {
*HostAddress = UncachedAllocatePages (Pages);
Allocation = UncachedAllocatePages (Pages);
} else if (MemoryType == EfiRuntimeServicesData) {
*HostAddress = UncachedAllocateRuntimePages (Pages);
Allocation = UncachedAllocateRuntimePages (Pages);
} else {
return EFI_INVALID_PARAMETER;
}
if (Allocation == NULL) {
return EFI_OUT_OF_RESOURCES;
}
*HostAddress = Allocation;
return EFI_SUCCESS;
}