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From:   Josh Poimboeuf <jpoimboe@redhat.com>
To:     x86@kernel.org
Cc:     linux-kernel@vger.kernel.org,
        Peter Zijlstra <peterz@infradead.org>,
        Miroslav Benes <mbenes@suse.cz>,
        Julien Thierry <jthierry@redhat.com>,
        "Gustavo A . R . Silva" <gustavo@embeddedor.com>
Subject: [PATCH 5/5] objtool: Make BP scratch register warning more robust
Date:   Wed,  1 Apr 2020 13:23:29 -0500
Message-Id: <afc628693a37acd287e843bcc5c0430263d93c74.1585761021.git.jpoimboe@redhat.com>
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If func is NULL, a seg fault can result.

This is a theoretical issue which was found by Coverity.

Fixes: c705cecc8431 ("objtool: Track original function across branches")
Addresses-Coverity-ID: 1492002 ("Dereference after null check")
Reported-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
---
 tools/objtool/check.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index c681a26c25ac..93fa7be67e9f 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -2023,8 +2023,8 @@ static int validate_return(struct symbol *func, str=
uct instruction *insn, struct
 	}
=20
 	if (state->bp_scratch) {
-		WARN("%s uses BP as a scratch register",
-		     func->name);
+		WARN_FUNC("BP used as a scratch register",
+			  insn->sec, insn->offset);
 		return 1;
 	}
=20
--=20
2.21.1