Messages in this thread | | | Subject | Re: [PATCH v2] scsi: zero per-cmd private driver data for each MQ I/O | From | "Martin K. Petersen" <> | Date | Thu, 18 May 2017 21:45:24 -0400 |
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Long,
> In lower layer driver's (LLD) scsi_host_template, the driver may > optionally ask SCSI to allocate its private driver memory for each > command, by specifying cmd_size. This memory is allocated at the end > of scsi_cmnd by SCSI. Later when SCSI queues a command, the LLD can > use scsi_cmd_priv to get to its private data. > > Some LLD, e.g. hv_storvsc, doesn't clear its private data before > use. In this case, the LLD may get to stale or uninitialized data in > its private driver memory. This may result in unexpected driver and > hardware behavior. > > Fix this problem by also zeroing the private driver memory before > passing them to LLD.
Applied to 4.12/scsi-fixes. Thank you!
-- Martin K. Petersen Oracle Linux Engineering
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