From e61ab39499124b30960985a32d5435bba3076905 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Fri, 9 Sep 2016 19:16:58 -0400 Subject: [PATCH 1/1] blackfin: fix copy_from_user() commit 8f035983dd826d7e04f67b28acf8e2f08c347e41 upstream. Signed-off-by: Al Viro Signed-off-by: Ben Hutchings --- arch/blackfin/include/asm/uaccess.h | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/arch/blackfin/include/asm/uaccess.h b/arch/blackfin/include/asm/uaccess.h index 5cc111502822..8f9d497a20a3 100644 --- a/arch/blackfin/include/asm/uaccess.h +++ b/arch/blackfin/include/asm/uaccess.h @@ -194,11 +194,12 @@ static inline int bad_user_access_length(void) 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 -- 2.39.2