diff options
| author | Al Viro | 2016-08-20 16:36:36 -0400 |
|---|---|---|
| committer | Al Viro | 2016-09-13 17:49:43 -0400 |
| commit | e33d1f6f72cc82fcfc3d1fb20c9e3ad83b1928fa (patch) | |
| tree | c011629541620a24690d290b7283c694f41311e7 /arch | |
| parent | ae7cc577ec2a4a6151c9e928fd1f595d953ecef1 (diff) | |
nios2: copy_from_user() should zero the tail of destination
Cc: stable@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/nios2/include/asm/uaccess.h | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/arch/nios2/include/asm/uaccess.h b/arch/nios2/include/asm/uaccess.h index caa51ff85a3c..2b4b9e919675 100644 --- a/arch/nios2/include/asm/uaccess.h +++ b/arch/nios2/include/asm/uaccess.h @@ -102,9 +102,12 @@ extern long __copy_to_user(void __user *to, const void *from, unsigned long n); static inline long copy_from_user(void *to, const void __user *from, unsigned long n) { - if (!access_ok(VERIFY_READ, from, n)) - return n; - return __copy_from_user(to, from, n); + unsigned long res = n; + if (access_ok(VERIFY_READ, from, n)) + res = __copy_from_user(to, from, n); + if (unlikely(res)) + memset(to + (n - res), 0, res); + return res; } static inline long copy_to_user(void __user *to, const void *from, |