diff options
| author | Clemens Ladisch <clemens@ladisch.de> | 2010-05-19 08:28:32 +0200 |
|---|---|---|
| committer | Stefan Richter <stefanr@s5r6.in-berlin.de> | 2010-06-09 19:42:18 +0200 |
| commit | a10c0ce76098857b899505d05de9f2e13ddf7a7a (patch) | |
| tree | 130592c6baaff2e38dd813448337dded1ee1645b /drivers/firewire/core-cdev.c | |
| parent | 262444eecce40950af19ea4d75a3dc03b3c07283 (diff) | |
firewire: check cdev response length
Add a check that the data length in the SEND_RESPONSE ioctl is correct.
Incidentally, this also fixes the previously wrong response length of
software-handled lock requests.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Diffstat (limited to 'drivers/firewire/core-cdev.c')
| -rw-r--r-- | drivers/firewire/core-cdev.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/firewire/core-cdev.c b/drivers/firewire/core-cdev.c index 9d1a1a1a83c9..50332b84f49a 100644 --- a/drivers/firewire/core-cdev.c +++ b/drivers/firewire/core-cdev.c @@ -756,9 +756,12 @@ static int ioctl_send_response(struct client *client, union ioctl_arg *arg) if (is_fcp_request(r->request)) goto out; - if (a->length < r->length) - r->length = a->length; - if (copy_from_user(r->data, u64_to_uptr(a->data), r->length)) { + if (a->length != fw_get_response_length(r->request)) { + ret = -EINVAL; + kfree(r->request); + goto out; + } + if (copy_from_user(r->data, u64_to_uptr(a->data), a->length)) { ret = -EFAULT; kfree(r->request); goto out; |