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


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

commit 7195ee3120d878259e8d94a5d9f808116f34d5ea upstream.

It's not clear what behaviour is sensible when doing partial write of
NT_METAG_RPIPE, so just don't bother.

This patch assumes that userspace will never rely on a partial SETREGSET
in this case, since it's not clear what should happen anyway.

Signed-off-by: Dave Martin <dave.mar...@arm.com>
Acked-by: James Hogan <james.ho...@imgtec.com>
Signed-off-by: Linus Torvalds <torva...@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

 arch/metag/kernel/ptrace.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/arch/metag/kernel/ptrace.c
+++ b/arch/metag/kernel/ptrace.c
@@ -253,6 +253,8 @@ int metag_rp_state_copyin(struct pt_regs
        unsigned long long *ptr;
        int ret, i;
+       if (count < 4*13)
+               return -EINVAL;
        /* Read the entire pipeline before making any changes */
        ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
                                 &rp, 0, 4*13);

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