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powerpc/powernv: fix construction of opal PRD messages

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We currently have a bug in the PRD code, where the contents of an
incoming message (beyond the header) will be overwritten by the list
item manipulations when adding to to the prd_msg_queue.

This change reorders struct opal_prd_msg_queue_item, so that the
message body doesn't overlap the list_head.

We also clarify the memcpy of the message, as we're copying unnecessary
bytes at the end of the message data.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Acked-by: Stewart Smith <stewart@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Jeremy Kerr 2015-06-15 17:25:34 +08:00 committed by Michael Ellerman
parent 02b6505c8f
commit 7185795a62
1 changed files with 12 additions and 7 deletions
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19
arch/powerpc/platforms/powernv/opal-prd.c
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@ -32,9 +32,13 @@
#include <asm/uaccess.h>
/**
* The msg member must be at the end of the struct, as it's followed by the
* message data.
*/
struct opal_prd_msg_queue_item {
struct opal_prd_msg_header msg;
struct list_head list;
struct opal_prd_msg_header msg;
};
static struct device_node *prd_node;
@ -351,22 +355,23 @@ static int opal_prd_msg_notifier(struct notifier_block *nb,
struct opal_prd_msg_queue_item *item;
struct opal_prd_msg_header *hdr;
struct opal_msg *msg = _msg;
int msg_size, item_size;
unsigned long flags;
int size;
if (msg_type != OPAL_MSG_PRD)
return 0;
/* Calculate total size of the item we need to store. The 'size' field
* in the header includes the header itself. */
/* Calculate total size of the message and item we need to store. The
* 'size' field in the header includes the header itself. */
hdr = (void *)msg->params;
size = (sizeof(*item) - sizeof(item->msg)) + be16_to_cpu(hdr->size);
msg_size = be16_to_cpu(hdr->size);
item_size = msg_size + sizeof(*item) - sizeof(item->msg);
item = kzalloc(size, GFP_ATOMIC);
item = kzalloc(item_size, GFP_ATOMIC);
if (!item)
return -ENOMEM;
memcpy(&item->msg, msg->params, size);
memcpy(&item->msg, msg->params, msg_size);
spin_lock_irqsave(&opal_prd_msg_queue_lock, flags);
list_add_tail(&item->list, &opal_prd_msg_queue);