sh64: failing __get_user() should zero

[ Upstream commit c6852389228df9fb3067f94f3b651de2a7921b36 ]

It could be done in exception-handling bits in __get_user_b() et.al.,
but the surgery involved would take more knowledge of sh64 details
than I have or _want_ to have.

Cc: stable@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>

diff --git a/arch/sh/include/asm/uaccess_64.h b/arch/sh/include/asm/uaccess_64.h
index c01376c76b868727b55bd117551cc1b96b93d8f1..ca5073dd459674d1ad835406fc46baa1957d01ac 100644 (file)
--- a/arch/sh/include/asm/uaccess_64.h
+++ b/arch/sh/include/asm/uaccess_64.h
@@ -24,6 +24,7 @@
 #define __get_user_size(x,ptr,size,retval)                     \
 do {                                                           \
        retval = 0;                                             \
+       x = 0;                                                  \
        switch (size) {                                         \
        case 1:                                                 \
                retval = __get_user_asm_b((void *)&x,           \