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Fix MmAllocatePageForMdl when it cannot allocate as much memory as requested.

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svn path=/trunk/; revision=13042
This commit is contained in:
Gregor Anich 2005-01-14 14:47:03 +00:00
parent c4f5066636
commit 6182a1c5f7
1 changed files with 12 additions and 4 deletions
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16
reactos/ntoskrnl/mm/mdl.c
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@ -637,9 +637,8 @@ MmAllocatePagesForMdl ( IN PHYSICAL_ADDRESS LowAddress,
memory. When a driver wants to access physical memory described by a
sub-MDL it must map the sub-MDL using MmGetSystemAddressForMdlSafe.
Konstantin Gusev
*/
Konstantin Gusev
*/
PMDL Mdl;
PPFN_TYPE Pages;
@ -652,7 +651,11 @@ MmAllocatePagesForMdl ( IN PHYSICAL_ADDRESS LowAddress,
SkipBytes.QuadPart, Totalbytes);
/* SkipBytes must be a multiple of the page size */
ASSERT((SkipBytes.QuadPart % PAGE_SIZE) == 0);
if ((SkipBytes.QuadPart % PAGE_SIZE) != 0)
{
DPRINT1("Warning: SkipBytes is not a multiple of PAGE_SIZE\n");
return NULL;
}
/* Allocate memory for the MDL */
Mdl = MmCreateMdl(NULL, 0, Totalbytes);
@ -690,6 +693,11 @@ MmAllocatePagesForMdl ( IN PHYSICAL_ADDRESS LowAddress,
ExFreePool(Mdl);
Mdl = NULL;
}
else if (NumberOfPagesWanted > 0)
{
Mdl->ByteCount = (ULONG)(NumberOfPagesAllocated * PAGE_SIZE);
/* FIXME: I don't know if Mdl->Size should also be changed -- blight */
}
return Mdl;
}