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firewire: cdev: tcodes input validation

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The behaviour of fw-transaction.c::fw_send_request is ill-defined for
any other tcodes than read/ write/ lock request tcodes.  Therefore
prevent requests with wrong tcodes from entering the transaction layer.

Maybe fw_send_request should check them itself, but I am not inclined to
change it and fw_fill_request from void-valued functions to ones which
return error codes and pass those up.  Besides, maybe fw_send_request is
going to support one more tcode than ioctl_send_request in the future
(TCODE_STREAM_DATA).

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
This commit is contained in:
Stefan Richter 2008-12-05 22:44:42 +01:00
parent bf8e3355ec
commit 1f3125af8e
1 changed files with 25 additions and 2 deletions
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27
drivers/firewire/fw-cdev.c
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@ -398,6 +398,7 @@ static int ioctl_send_request(struct client *client, void *buffer)
struct fw_device *device = client->device;
struct fw_cdev_send_request *request = buffer;
struct response *response;
int ret;
/* What is the biggest size we'll accept, really? */
if (request->length > 4096)
@ -414,8 +415,26 @@ static int ioctl_send_request(struct client *client, void *buffer)
if (request->data &&
copy_from_user(response->response.data,
u64_to_uptr(request->data), request->length)) {
kfree(response);
return -EFAULT;
ret = -EFAULT;
goto err;
}
switch (request->tcode) {
case TCODE_WRITE_QUADLET_REQUEST:
case TCODE_WRITE_BLOCK_REQUEST:
case TCODE_READ_QUADLET_REQUEST:
case TCODE_READ_BLOCK_REQUEST:
case TCODE_LOCK_MASK_SWAP:
case TCODE_LOCK_COMPARE_SWAP:
case TCODE_LOCK_FETCH_ADD:
case TCODE_LOCK_LITTLE_ADD:
case TCODE_LOCK_BOUNDED_ADD:
case TCODE_LOCK_WRAP_ADD:
case TCODE_LOCK_VENDOR_DEPENDENT:
break;
default:
ret = -EINVAL;
goto err;
}
response->resource.release = release_transaction;
@ -434,6 +453,10 @@ static int ioctl_send_request(struct client *client, void *buffer)
return sizeof(request) + request->length;
else
return sizeof(request);
err:
kfree(response);
return ret;
}
struct address_handler {