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- SEHify LockRequest

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- Free everything and return if MmMapLockedPages fails

svn path=/branches/aicom-network-fixes/; revision=35454
This commit is contained in:
Cameron Gutman 2008-08-19 16:23:01 +00:00
parent ea2d464b14
commit 2a199d0cb2
1 changed files with 21 additions and 1 deletions
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22
drivers/network/afd/afd/lock.c
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@ -15,6 +15,8 @@
/* Lock a method_neither request so it'll be available from DISPATCH_LEVEL */
PVOID LockRequest( PIRP Irp, PIO_STACK_LOCATION IrpSp ) {
BOOLEAN LockFailed = FALSE;
Irp->MdlAddress =
IoAllocateMdl( IrpSp->Parameters.DeviceIoControl.Type3InputBuffer,
IrpSp->Parameters.DeviceIoControl.InputBufferLength,
@ -22,9 +24,27 @@ PVOID LockRequest( PIRP Irp, PIO_STACK_LOCATION IrpSp ) {
FALSE,
NULL );
if( Irp->MdlAddress ) {
MmProbeAndLockPages( Irp->MdlAddress, KernelMode, IoModifyAccess );
_SEH_TRY {
MmProbeAndLockPages( Irp->MdlAddress, KernelMode, IoModifyAccess );
} _SEH_HANDLE {
LockFailed = TRUE;
} _SEH_END;
if( LockFailed ) {
IoFreeMdl( Irp->MdlAddress );
Irp->MdlAddress = NULL;
return NULL;
}
IrpSp->Parameters.DeviceIoControl.Type3InputBuffer =
MmMapLockedPages( Irp->MdlAddress, KernelMode );
if( !IrpSp->Parameters.DeviceIoControl.Type3InputBuffer ) {
IoFreeMdl( Irp->MdlAddress );
Irp->MdlAddress = NULL;
return NULL;
}
return IrpSp->Parameters.DeviceIoControl.Type3InputBuffer;
} else return NULL;
}