linux-kernel - [tip: objtool/core] objtool: is_fentry_call() crashes if call has no destination

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Date:   Fri, 01 May 2020 18:22:22 -0000
From:   "tip-bot2 for Alexandre Chartre" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Alexandre Chartre <alexandre.chartre@...cle.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Miroslav Benes <mbenes@...e.cz>,
        Josh Poimboeuf <jpoimboe@...hat.com>, x86 <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [tip: objtool/core] objtool: is_fentry_call() crashes if call has no
 destination

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

Commit-ID:     87cf61fe848ca8ddf091548671e168f52e8a718e
Gitweb:        https://git.kernel.org/tip/87cf61fe848ca8ddf091548671e168f52e8a718e
Author:        Alexandre Chartre <alexandre.chartre@...cle.com>
AuthorDate:    Tue, 14 Apr 2020 12:36:10 +02:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Thu, 30 Apr 2020 20:14:32 +02:00

objtool: is_fentry_call() crashes if call has no destination

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 fa9bf36..8af8de2 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -1484,7 +1484,7 @@ 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;