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uprobes/x86: Remove incorrect WARN_ON() in uprobe_init_insn()
insn_get_length() has the side-effect of processing the entire instruction but only if it was decoded successfully, otherwise insn_complete() can fail and in this case we need to just return an error without warning. Reported-by: syzbot+30d675e3ca03c1c351e7@syzkaller.appspotmail.com Signed-off-by: Oleg Nesterov <oleg@redhat.com> Reviewed-by: Masami Hiramatsu <mhiramat@kernel.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: syzkaller-bugs@googlegroups.com Link: https://lkml.kernel.org/lkml/20180518162739.GA5559@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
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@ -293,7 +293,7 @@ static int uprobe_init_insn(struct arch_uprobe *auprobe, struct insn *insn, bool
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insn_init(insn, auprobe->insn, sizeof(auprobe->insn), x86_64);
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/* has the side-effect of processing the entire instruction */
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insn_get_length(insn);
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if (WARN_ON_ONCE(!insn_complete(insn)))
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if (!insn_complete(insn))
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return -ENOEXEC;
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if (is_prefix_bad(insn))
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