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Date: Mon, 14 Nov 2016 00:14:07 +0000 From: Ben Hutchings <ben@...adent.org.uk> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org CC: akpm@...ux-foundation.org, "Al Viro" <viro@...iv.linux.org.uk> Subject: [PATCH 3.2 120/152] sh: fix copy_from_user() 3.2.84-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Al Viro <viro@...iv.linux.org.uk> commit 6e050503a150b2126620c1a1e9b3a368fcd51eac upstream. Signed-off-by: Al Viro <viro@...iv.linux.org.uk> Signed-off-by: Ben Hutchings <ben@...adent.org.uk> --- arch/sh/include/asm/uaccess.h | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) --- 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 __us __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; }
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