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- Fix mdl probe access rights

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svn path=/trunk/; revision=49336
This commit is contained in:
Johannes Anderwald 2010-10-29 00:41:06 +00:00
parent ed04f3bb51
commit 4995df02c5
1 changed files with 14 additions and 4 deletions
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18
reactos/drivers/ksfilter/ks/irp.c
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@ -724,7 +724,16 @@ ProbeMdl:
Mdl = Irp->MdlAddress; Mdl = Irp->MdlAddress;
/* determine operation */ /* determine operation */
Operation = (ProbeFlags & KSPROBE_STREAMWRITE) ? IoWriteAccess : IoReadAccess; if (!(ProbeFlags & KSPROBE_STREAMWRITE) || (ProbeFlags & KSPROBE_MODIFY))
{
/* operation is read / modify stream, need write access */
Operation = IoWriteAccess;
}
else
{
/* operation is write to device, so we need read access */
Operation = IoReadAccess;
}
do do
{ {
@ -859,7 +868,8 @@ ProbeMdl:
if (StreamHeader->FrameExtent) if (StreamHeader->FrameExtent)
{ {
/* allocate an mdl */ /* allocate an mdl */
Mdl = IoAllocateMdl(StreamHeader->Data, StreamHeader->FrameExtent, Irp->MdlAddress != NULL, TRUE, Irp); ASSERT(Irp->MdlAddress == NULL);
Mdl = IoAllocateMdl(StreamHeader->Data, StreamHeader->FrameExtent, FALSE, TRUE, Irp);
if (!Mdl) if (!Mdl)
{ {
/* not enough memory */ /* not enough memory */
@ -880,10 +890,10 @@ ProbeMdl:
/* now probe the allocated mdl's */ /* now probe the allocated mdl's */
if (!NT_SUCCESS(Status)) if (!NT_SUCCESS(Status))
{ {
DPRINT("Status %x\n", Status); DPRINT("Status %x\n", Status);
return Status; return Status;
} }
else else
goto ProbeMdl; goto ProbeMdl;
} }