linux-kernel - [PATCH 1/3] objtool: is_fentry_call() crashes if call has no destination

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Message-Id: <20240226094101.95544-2-qirui.001@bytedance.com>
Date: Mon, 26 Feb 2024 17:40:59 +0800
From: "$(name)" <qirui.001@...edance.com>
To: bp@...en8.de,
	mingo@...hat.com,
	tglx@...utronix.de,
	hpa@...or.com,
	jpoimboe@...hat.com,
	peterz@...radead.org,
	mbenes@...e.cz,
	gregkh@...uxfoundation.org,
	stable@...r.kernel.org,
	alexandre.chartre@...cle.com
Cc: x86@...nel.org,
	linux-kernel@...r.kernel.org,
	qirui.001@...edance.com
Subject: [PATCH 1/3] objtool: is_fentry_call() crashes if call has no destination

From: Alexandre Chartre <alexandre.chartre@...cle.com>

commit 87cf61fe848ca8ddf091548671e168f52e8a718e upstream.

Fix is_fentry_call() so that it works if a call has no destination
set (call_dest). This needs to be done in order to support intra-
function calls.

Signed-off-by: Alexandre Chartre <alexandre.chartre@...cle.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Reviewed-by: Miroslav Benes <mbenes@...e.cz>
Acked-by: Josh Poimboeuf <jpoimboe@...hat.com>
Link: https://lkml.kernel.org/r/20200414103618.12657-2-alexandre.chartre@oracle.com
---
 tools/objtool/check.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index dfd67243faac..71a24fd46dbd 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -1367,7 +1367,7 @@ static int decode_sections(struct objtool_file *file)
 
 static bool is_fentry_call(struct instruction *insn)
 {
-	if (insn->type == INSN_CALL &&
+	if (insn->type == INSN_CALL && insn->call_dest &&
 	    insn->call_dest->type == STT_NOTYPE &&
 	    !strcmp(insn->call_dest->name, "__fentry__"))
 		return true;
-- 
2.39.2 (Apple Git-143)