firewire: Preserve response data alignment bug when it is harmless

Recently, a bug having to do with the alignment of transaction response
data was fixed.  However, some apps such as libdc1394 relied on the
presence of that bug in order to function correctly.  In order to stay
compatible with old versions of those apps, this patch preserves the bug
in cases where it is harmless to normal operation (such as the single
quadlet read) due to a simple duplication of data.  This guarantees
maximum compatability for those users who are using the old app with the
fixed kernel.

Signed-off-by: David Moore <dcm@acm.org>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

diff --git a/drivers/firewire/fw-cdev.c b/drivers/firewire/fw-cdev.c
index bc81d6fcd2fd2bbc043f31d8707aaaaf3d34a01a..2e6d5848d2172011f94058b09c8634c56b091dea 100644 (file)
--- a/drivers/firewire/fw-cdev.c
+++ b/drivers/firewire/fw-cdev.c
@@ -369,22 +369,33 @@ complete_transaction(struct fw_card *card, int rcode,
        struct response *response = data;
        struct client *client = response->client;
        unsigned long flags;
+       struct fw_cdev_event_response *r = &response->response;
 
-       if (length < response->response.length)
-               response->response.length = length;
+       if (length < r->length)
+               r->length = length;
        if (rcode == RCODE_COMPLETE)
-               memcpy(response->response.data, payload,
-                      response->response.length);
+               memcpy(r->data, payload, r->length);
 
        spin_lock_irqsave(&client->lock, flags);
        list_del(&response->resource.link);
        spin_unlock_irqrestore(&client->lock, flags);
 
-       response->response.type   = FW_CDEV_EVENT_RESPONSE;
-       response->response.rcode  = rcode;
-       queue_event(client, &response->event, &response->response,
-                   sizeof(response->response) + response->response.length,
-                   NULL, 0);
+       r->type   = FW_CDEV_EVENT_RESPONSE;
+       r->rcode  = rcode;
+
+       /*
+        * In the case that sizeof(*r) doesn't align with the position of the
+        * data, and the read is short, preserve an extra copy of the data
+        * to stay compatible with a pre-2.6.27 bug.  Since the bug is harmless
+        * for short reads and some apps depended on it, this is both safe
+        * and prudent for compatibility.
+        */
+       if (r->length <= sizeof(*r) - offsetof(typeof(*r), data))
+               queue_event(client, &response->event, r, sizeof(*r),
+                           r->data, r->length);
+       else
+               queue_event(client, &response->event, r, sizeof(*r) + r->length,
+                           NULL, 0);
 }
 
 static int ioctl_send_request(struct client *client, void *buffer)