Commit 5ba0bf47 authored Feb 07, 2016 by Alexander Usyskin Committed by Greg Kroah-Hartman Feb 07, 2016

mei: amthif: don't copy from an empty buffer



If empty message come from FW (buf_idx == 0) then the current code will
still try to copy data from not filled buffer to the user-space,
instead the code should behave the same as when end of a message
has been reached, clean resources and return 0

Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent 1f7e489a

drivers/misc/mei/amthif.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -185,7 +185,7 @@ int mei_amthif_read(struct mei_device dev, struct file file,
		/* if the whole message will fit remove it from the list */
		if (cb->buf_idx >= offset && length >= (cb->buf_idx - offset))
		list_del_init(&cb->list);
		else if (cb->buf_idx > 0 && cb->buf_idx <= *offset) {
		else if (cb->buf_idx <= *offset) {
		/* end of the message has been reached */
		list_del_init(&cb->list);
		rets = 0;