3.18-stable review patch.  If anyone has any objections, please let me know.


From: Dave Martin <dave.mar...@arm.com>

commit d3805c546b275c8cc7d40f759d029ae92c7175f2 upstream.

Ensure that if userspace supplies insufficient data to PTRACE_SETREGSET
to fill all the registers, the thread's old registers are preserved.

Signed-off-by: Dave Martin <dave.mar...@arm.com>
Acked-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Linus Torvalds <torva...@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

 arch/sparc/kernel/ptrace_64.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/sparc/kernel/ptrace_64.c
+++ b/arch/sparc/kernel/ptrace_64.c
@@ -311,7 +311,7 @@ static int genregs64_set(struct task_str
        if (!ret) {
-               unsigned long y;
+               unsigned long y = regs->y;
                ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,

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