diff options
| author | Heiko Carstens | 2017-08-07 15:16:15 +0200 |
|---|---|---|
| committer | Martin Schwidefsky | 2017-08-09 09:09:32 -0400 |
| commit | 267239cc10f18251892a0783104df3dc22b620d5 (patch) | |
| tree | f420241fbc3f469085c8d5a2105a90b3fd4d26ac /arch | |
| parent | 34ad7cdc1bb2ea65934d235be89fabf1bb40d824 (diff) | |
s390/vmcp: fix uaccess check and avoid undefined behavior
The vmcp device driver should return -EFAULT if get_user() fails, due
to an invalid user space address. In addition the buffer size value
from user space is passed unchecked to get_order(). The return value
of get_order(0) undefined.
Therefore explicitly test for zero before calling get_order() and also
return -EFAULT if get_user() fails.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch')
0 files changed, 0 insertions, 0 deletions