| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.7 174/184] metag: copy_from_user() should zero the destination on access_ok() failure | Date | Thu, 22 Sep 2016 19:41:48 +0200 |
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4.7-stable review patch. If anyone has any objections, please let me know.
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From: Al Viro <viro@zeniv.linux.org.uk>
commit 8ae95ed4ae5fc7c3391ed668b2014c9e2079533b upstream.
Acked-by: James Hogan <james.hogan@imgtec.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- arch/metag/include/asm/uaccess.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/arch/metag/include/asm/uaccess.h +++ b/arch/metag/include/asm/uaccess.h @@ -204,8 +204,9 @@ extern unsigned long __must_check __copy static inline unsigned long 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))) return __copy_user_zeroing(to, from, n); + memset(to, 0, n); return n; }
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