kachalovan@xxxxxxxxxxx wrote: > my virtal audio microphone driver based on msvad simple sample has BSOD > dump reports from sysdev.microsoft.com. These dumps file after analyzing > gave information that crash occur at > CMiniportWaveCyclicStreamMSVAD::CopyFrom method during write operation at > RtlCopyMemory from internal audio buffer to destination client's buffer. I > suspect that this BSOD possible after unexpected exit or crash of client > applications. > > Attempts to detect wrong pointer pointer to destination buffer with using > ProbeForWrite or MmProbeAndLockPages always gave exception result, > included cases than pointer was valid. > > How to right check wrong pointer in this case? Are you sure it's the destination address that has the issue? CopyFrom should be handed two kernel-mode virtual addresses. No probing and locking is required. I would be more likely to guess that something in your setup is causing your buffer address to go invalid. Are you freeing the buffer during your cleanup? Can you induce this to happen in your testing? -- Tim Roberts, timr@xxxxxxxxx Providenza & Boekelheide, Inc. ****************** WDMAUDIODEV addresses: Post message: mailto:wdmaudiodev@xxxxxxxxxxxxx Subscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=subscribe Unsubscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=unsubscribe Moderator: mailto:wdmaudiodev-moderators@xxxxxxxxxxxxx URL to WDMAUDIODEV page: http://www.wdmaudiodev.com/