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Commit 2ce9d227 authored by Petr Vandrovec's avatar Petr Vandrovec Committed by Greg Kroah-Hartman
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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: default avatarPetr Vandrovec <petr@vandrovec.name>
Cc: stable <stable@vger.kernel.org>
Acked-by: default avatarAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent a25f0944

drivers/usb/storage/transport.c

+6 −1
Original line number Diff line number Diff line
@@ -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",