[tip: objtool/urgent] objtool: Stop UNRET validation on UD2

[tip-bot2 for Josh Poimboeuf]

The following commit has been merged into the objtool/urgent branch of tip:

Commit-ID:     9f9cc012c2cbac4833746a0182e06a8eec940d19
Gitweb:        https://git.kernel.org/tip/9f9cc012c2cbac4833746a0182e06a8eec940d19
Author:        Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
AuthorDate:    Tue, 08 Apr 2025 00:02:15 -07:00
Committer:     Ingo Molnar <mingo@xxxxxxxxxx>
CommitterDate: Tue, 08 Apr 2025 09:14:11 +02:00

objtool: Stop UNRET validation on UD2

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@xxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/ce841269e7e28c8b7f32064464a9821034d724ff.1744095216.git.jpoimboe@xxxxxxxxxx
---
 tools/objtool/check.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 2c703b9..2dd89b0 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -3902,6 +3902,9 @@ 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;