diff options
| author | Al Viro <viro@zeniv.linux.org.uk> | 2016-08-20 16:36:36 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-09-24 10:07:45 +0200 |
| commit | ba5bfcba1f57eb99f6ef4fe91e2d1d9d8b9f4d50 (patch) | |
| tree | 0393a8d86c81b603e95a6d4a9025670ac5901ad9 /arch | |
| parent | 40c38ca6075b5e0fdee03731936b0b5f86a49cbc (diff) | |
nios2: copy_from_user() should zero the tail of destination
commit e33d1f6f72cc82fcfc3d1fb20c9e3ad83b1928fa upstream.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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 ebac5bbfc340..0ab82324c817 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, |