x86/kprobes: Convert to insn_decode()

stable inclusion
from stable-v5.10.163
commit 5d112deb2a02701536d2b4446b8f0d843fcf6c0e
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I7PJ9N

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=5d112deb2a02701536d2b4446b8f0d843fcf6c0e



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[ Upstream commit 77e768ec ]

Simplify code, improve decoding error checking.

Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Link: https://lkml.kernel.org/r/20210304174237.31945-12-bp@alien8.de


Stable-dep-of: 63dc6325 ("x86/kprobes: Fix optprobe optimization check with CONFIG_RETHUNK")
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: zhaoxiaoqiang11 <zhaoxiaoqiang11@jd.com>