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| author | Michael Buesch <mb@bu3sch.de> | 2009-07-29 11:39:03 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-08-07 16:05:12 -0700 |
| commit | 18753ebc8a98efe0e8ff6167afb31cef220c8e50 (patch) | |
| tree | 7c2d95b3758acf4cf3b42aec04d284ae67de1647 /drivers | |
| parent | 49276560c9004fce24c42e3c0ad75f34d956fc63 (diff) | |
| download | lwn-18753ebc8a98efe0e8ff6167afb31cef220c8e50.tar.gz lwn-18753ebc8a98efe0e8ff6167afb31cef220c8e50.zip | |
USB: devio: Properly do access_ok() checks
access_ok() checks must be done on every part of the userspace structure
that is accessed. If access_ok() on one part of the struct succeeded, it
does not imply it will succeed on other parts of the struct. (Does
depend on the architecture implementation of access_ok()).
This changes the __get_user() users to first check access_ok() on the
data structure.
Signed-off-by: Michael Buesch <mb@bu3sch.de>
Cc: stable <stable@kernel.org>
Cc: Pete Zaitcev <zaitcev@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/usb/core/devio.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c index 38b8bce782d6..e192fa05f8a1 100644 --- a/drivers/usb/core/devio.c +++ b/drivers/usb/core/devio.c @@ -1321,7 +1321,8 @@ static int get_urb32(struct usbdevfs_urb *kurb, struct usbdevfs_urb32 __user *uurb) { __u32 uptr; - if (get_user(kurb->type, &uurb->type) || + if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) || + __get_user(kurb->type, &uurb->type) || __get_user(kurb->endpoint, &uurb->endpoint) || __get_user(kurb->status, &uurb->status) || __get_user(kurb->flags, &uurb->flags) || @@ -1536,8 +1537,9 @@ static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg) u32 udata; uioc = compat_ptr((long)arg); - if (get_user(ctrl.ifno, &uioc->ifno) || - get_user(ctrl.ioctl_code, &uioc->ioctl_code) || + if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) || + __get_user(ctrl.ifno, &uioc->ifno) || + __get_user(ctrl.ioctl_code, &uioc->ioctl_code) || __get_user(udata, &uioc->data)) return -EFAULT; ctrl.data = compat_ptr(udata); |