linux-kernel - [PATCH 3.2 097/104] x86/spectre: Fix an error message

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Date:   Mon, 12 Mar 2018 03:03:34 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Thomas Gleixner" <tglx@...utronix.de>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        "Andy Lutomirski" <luto@...nel.org>,
        "Ingo Molnar" <mingo@...nel.org>, kernel-janitors@...r.kernel.org,
        "Dan Carpenter" <dan.carpenter@...cle.com>,
        "Borislav Petkov" <bp@...e.de>,
        "Linus Torvalds" <torvalds@...ux-foundation.org>,
        "Peter Zijlstra" <peterz@...radead.org>,
        "David Woodhouse" <dwmw@...zon.co.uk>,
        "KarimAllah Ahmed" <karahmed@...zon.de>
Subject: [PATCH 3.2 097/104] x86/spectre: Fix an error message

3.2.101-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Dan Carpenter <dan.carpenter@...cle.com>

commit 9de29eac8d2189424d81c0d840cd0469aa3d41c8 upstream.

If i == ARRAY_SIZE(mitigation_options) then we accidentally print
garbage from one space beyond the end of the mitigation_options[] array.

Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Borislav Petkov <bp@...e.de>
Cc: David Woodhouse <dwmw@...zon.co.uk>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: KarimAllah Ahmed <karahmed@...zon.de>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: kernel-janitors@...r.kernel.org
Fixes: 9005c6834c0f ("x86/spectre: Simplify spectre_v2 command line parsing")
Link: http://lkml.kernel.org/r/20180214071416.GA26677@mwanda
Signed-off-by: Ingo Molnar <mingo@...nel.org>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -317,8 +317,7 @@ static enum spectre_v2_mitigation_cmd __
 		}
 
 		if (i >= ARRAY_SIZE(mitigation_options)) {
-			pr_err("unknown option (%s). Switching to AUTO select\n",
-			       mitigation_options[i].option);
+			pr_err("unknown option (%s). Switching to AUTO select\n", arg);
 			return SPECTRE_V2_CMD_AUTO;
 		}
 	}