diff options
| author | Petr Vandrovec <petr@vandrovec.name> | 2016-11-10 22:57:14 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-11-15 11:08:51 +0100 |
| commit | 2ce9d2272b98743b911196c49e7af5841381c206 (patch) | |
| tree | 3c1a53c027c1792333c50279e7074c47cec0d7b4 | |
| parent | Linux 4.9-rc5 (diff) | |
| download | linux-2ce9d2272b98743b911196c49e7af5841381c206.tar.xz linux-2ce9d2272b98743b911196c49e7af5841381c206.zip | |
Fix USB CB/CBI storage devices with CONFIG_VMAP_STACK=y
Some code (all error handling) submits CDBs that are allocated
on the stack. This breaks with CB/CBI code that tries to create
URB directly from SCSI command buffer - which happens to be in
vmalloced memory with vmalloced kernel stacks.
Let's make copy of the command in usb_stor_CB_transport.
Signed-off-by: Petr Vandrovec <petr@vandrovec.name>
Cc: stable <stable@vger.kernel.org>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/usb/storage/transport.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/usb/storage/transport.c b/drivers/usb/storage/transport.c index ffd086733421..1a59f335b063 100644 --- a/drivers/usb/storage/transport.c +++ b/drivers/usb/storage/transport.c @@ -954,10 +954,15 @@ int usb_stor_CB_transport(struct scsi_cmnd *srb, struct us_data *us) /* COMMAND STAGE */ /* let's send the command via the control pipe */ + /* + * Command is sometime (f.e. after scsi_eh_prep_cmnd) on the stack. + * Stack may be vmallocated. So no DMA for us. Make a copy. + */ + memcpy(us->iobuf, srb->cmnd, srb->cmd_len); result = usb_stor_ctrl_transfer(us, us->send_ctrl_pipe, US_CBI_ADSC, USB_TYPE_CLASS | USB_RECIP_INTERFACE, 0, - us->ifnum, srb->cmnd, srb->cmd_len); + us->ifnum, us->iobuf, srb->cmd_len); /* check the return code for the command */ usb_stor_dbg(us, "Call to usb_stor_ctrl_transfer() returned %d\n", |