linux-kernel - [PATCH AUTOSEL 5.4 2/7] objtool: Fix SEGFAULT

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Message-Id: <20221227203534.1214640-2-sashal@kernel.org>
Date:   Tue, 27 Dec 2022 15:35:27 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Christophe Leroy <christophe.leroy@...roup.eu>,
        "Naveen N . Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
        Josh Poimboeuf <jpoimboe@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 5.4 2/7] objtool: Fix SEGFAULT

From: Christophe Leroy <christophe.leroy@...roup.eu>

[ Upstream commit efb11fdb3e1a9f694fa12b70b21e69e55ec59c36 ]

find_insn() will return NULL in case of failure. Check insn in order
to avoid a kernel Oops for NULL pointer dereference.

Tested-by: Naveen N. Rao <naveen.n.rao@...ux.vnet.ibm.com>
Reviewed-by: Naveen N. Rao <naveen.n.rao@...ux.vnet.ibm.com>
Acked-by: Josh Poimboeuf <jpoimboe@...nel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
Link: https://lore.kernel.org/r/20221114175754.1131267-9-sv@linux.ibm.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 bae6b261481d..ccf5580442d2 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -162,7 +162,7 @@ static bool __dead_end_function(struct objtool_file *file, struct symbol *func,
 		return false;
 
 	insn = find_insn(file, func->sec, func->offset);
-	if (!insn->func)
+	if (!insn || !insn->func)
 		return false;
 
 	func_for_each_insn_all(file, func, insn) {
-- 
2.35.1