linux-kernel - [PATCH] x86/retpoline: Fix crash printing warning

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Date:   Tue, 25 Oct 2022 18:32:49 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>,
        Josh Poimboeuf <jpoimboe@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Song Liu <song@...nel.org>, Nadav Amit <namit@...are.com>,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH] x86/retpoline: Fix crash printing warning

The first argument of WARN() is a condition, so this will use "addr"
as the format string and possibly crash.

Fixes: 3b6c1747da48 ("x86/retpoline: Add SKL retthunk retpolines")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
---
 arch/x86/kernel/alternative.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c
index 19221d77dc27..b4ac4e58c010 100644
--- a/arch/x86/kernel/alternative.c
+++ b/arch/x86/kernel/alternative.c
@@ -418,7 +418,7 @@ static int emit_call_track_retpoline(void *addr, struct insn *insn, int reg, u8
 		break;
 
 	default:
-		WARN("%pS %px %*ph\n", addr, addr, 6, addr);
+		WARN(1, "%pS %px %*ph\n", addr, addr, 6, addr);
 		return -1;
 	}
 
-- 
2.35.1