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x86/fpu: Limit xstate copy size in xstateregs_set()
[ Upstream commit 07d6688 ] If the count argument is larger than the xstate size, this will happily copy beyond the end of xstate. Fixes: 91c3dba ("x86/fpu/xstate: Fix PTRACE frames for XSAVES") Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Borislav Petkov <bp@suse.de> Reviewed-by: Andy Lutomirski <luto@kernel.org> Reviewed-by: Borislav Petkov <bp@suse.de> Link: https://lkml.kernel.org/r/20210623121452.120741557@linutronix.de Signed-off-by: Sasha Levin <sashal@kernel.org>
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