On Mon, 11 Jul 2022 10:51:32 -0400, Tony Battersby wrote:
> When a SCSI device is removed while in active use, currently sg will
> immediately return -ENODEV on any attempt to wait for active commands
> that were sent before the removal. This is problematic for commands
> that use SG_FLAG_DIRECT_IO since the data buffer may still be in use by
> the kernel when userspace frees or reuses it after getting ENODEV,
> leading to corrupted userspace memory (in the case of READ-type
> commands) or corrupted data being sent to the device (in the case of
> WRITE-type commands). This has been seen in practice when logging out
> of a iscsi_tcp session, where the iSCSI driver may still be processing
> commands after the device has been marked for removal.
>
> [...]
Applied to 5.20/scsi-queue, thanks!
[1/1] sg: allow waiting for commands to complete on removed device
https://git.kernel.org/mkp/scsi/c/3455607fd7be
--
Martin K. Petersen Oracle Linux Engineering
