firewire: cdev: extend transaction payload size check

Make the size check of ioctl_send_request and
ioctl_send_broadcast_request speed dependent.  Also change the error
return code from -EINVAL to -EIO to distinguish this from other errors
concerning the ioctl parameters.

Another payload size limit for which we don't check here though is the
remote node's Bus_Info_Block.max_rec.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

1 files changed, 2 insertions, 3 deletions

diff --git a/drivers/firewire/fw-cdev.c b/drivers/firewire/fw-cdev.c
index d48fa1c23a77..6b33f15584cb 100644
--- a/drivers/firewire/fw-cdev.c
+++ b/drivers/firewire/fw-cdev.c
@@ -525,9 +525,8 @@ static int init_request(struct client *client,
         struct outbound_transaction_event *e;
         int ret;
 
-        /* What is the biggest size we'll accept, really? */
-        if (request->length > 4096)
-                return -EINVAL;
+        if (request->length > 4096 || request->length > 512 << speed)
+                return -EIO;
 
         e = kmalloc(sizeof(*e) + request->length, GFP_KERNEL);
         if (e == NULL)