objtool: Stop UNRET validation on UD2

[ Upstream commit 9f9cc012c2cbac4833746a0182e06a8eec940d19 ]

In preparation for simplifying INSN_SYSCALL, make validate_unret()
terminate control flow on UD2 just like validate_branch() already does.

Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lore.kernel.org/r/ce841269e7e28c8b7f32064464a9821034d724ff.1744095216.git.jpoimboe@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index bbfd81f49802edbf8d7dbdb1ca960d2810596924..eb9109b4aaf35322c6c8597aa0bb5bbef20f2424 100644 (file)
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -3870,6 +3870,9 @@ static int validate_unret(struct objtool_file *file, struct instruction *insn)
                        break;
                }
 
+               if (insn->dead_end)
+                       return 0;
+
                if (!next) {
                        WARN_INSN(insn, "teh end!");
                        return -1;