From 6089b5ee9c5f2de2bae342da15afe8d4124b9ebe Mon Sep 17 00:00:00 2001 From: Al Viro Date: Sun, 21 Aug 2016 23:39:47 -0400 Subject: [PATCH] sh: fix copy_from_user() commit 6e050503a150b2126620c1a1e9b3a368fcd51eac upstream. Signed-off-by: Al Viro Signed-off-by: Ben Hutchings --- arch/sh/include/asm/uaccess.h | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/arch/sh/include/asm/uaccess.h b/arch/sh/include/asm/uaccess.h index 075848f43b6a..0e7971185be5 100644 --- a/arch/sh/include/asm/uaccess.h +++ b/arch/sh/include/asm/uaccess.h @@ -175,7 +175,10 @@ copy_from_user(void *to, const void __user *from, unsigned long n) __kernel_size_t __copy_size = (__kernel_size_t) n; if (__copy_size && __access_ok(__copy_from, __copy_size)) - return __copy_user(to, from, __copy_size); + __copy_size = __copy_user(to, from, __copy_size); + + if (unlikely(__copy_size)) + memset(to + (n - __copy_size), 0, __copy_size); return __copy_size; } -- 2.39.2