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storvsc: be more picky about scmnd->sc_data_direction

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Under the 'default' case in scmnd->sc_data_direction we have 3 options:
- DMA_NONE which we handle correctly.
- DMA_BIDIRECTIONAL which is never supposed to be set by SCSI stack.
- Garbage value.

Do WARN() and return -EINVAL in the last two cases. virtio_scsi does
BUG_ON() here but it looks like an overkill.

Reported-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Acked-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: James Bottomley <JBottomley@Odin.com>
This commit is contained in:
Vitaly Kuznetsov 2015-06-25 18:12:11 +02:00 committed by James Bottomley
parent 10978e48cc
commit cb1cf0804f
1 changed files with 9 additions and 1 deletions
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10
drivers/scsi/storvsc_drv.c
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@ -1598,10 +1598,18 @@ static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd)
vm_srb->data_in = READ_TYPE;
vm_srb->win8_extension.srb_flags |= SRB_FLAGS_DATA_IN;
break;
default:
case DMA_NONE:
vm_srb->data_in = UNKNOWN_TYPE;
vm_srb->win8_extension.srb_flags |= SRB_FLAGS_NO_DATA_TRANSFER;
break;
default:
/*
* This is DMA_BIDIRECTIONAL or something else we are never
* supposed to see here.
*/
WARN(1, "Unexpected data direction: %d\n",
scmnd->sc_data_direction);
return -EINVAL;
}