4.7-stable review patch. If anyone has any objections, please let me know.
------------------ From: Al Viro <v...@zeniv.linux.org.uk> commit 8f035983dd826d7e04f67b28acf8e2f08c347e41 upstream. Signed-off-by: Al Viro <v...@zeniv.linux.org.uk> Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org> --- arch/blackfin/include/asm/uaccess.h | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) --- a/arch/blackfin/include/asm/uaccess.h +++ b/arch/blackfin/include/asm/uaccess.h @@ -171,11 +171,12 @@ static inline int bad_user_access_length static inline unsigned long __must_check copy_from_user(void *to, const void __user *from, unsigned long n) { - if (access_ok(VERIFY_READ, from, n)) + if (likely(access_ok(VERIFY_READ, from, n))) { memcpy(to, (const void __force *)from, n); - else - return n; - return 0; + return 0; + } + memset(to, 0, n); + return n; } static inline unsigned long __must_check