linux-kernel - [PATCH 1/2] tools/x86/kcpuid: Check last token too

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Message-Id: <20210315125901.30315-1-bp@alien8.de>
Date:   Mon, 15 Mar 2021 13:59:00 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Feng Tang <feng.tang@...el.com>
Cc:     X86 ML <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/2] tools/x86/kcpuid: Check last token too

From: Borislav Petkov <bp@...e.de>

Input lines like

  0x8000001E,     0, EAX,   31:0, Extended APIC ID

where the short name is missing lead to a segfault because the loop
takes the long name for the short name and tokens[5] becomes NULL which
explodes later in strcpy().

Check its value too before further processing.

Signed-off-by: Borislav Petkov <bp@...e.de>
---
 tools/arch/x86/kcpuid/kcpuid.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/arch/x86/kcpuid/kcpuid.c b/tools/arch/x86/kcpuid/kcpuid.c
index 6048da34fcc6..dae75511fef7 100644
--- a/tools/arch/x86/kcpuid/kcpuid.c
+++ b/tools/arch/x86/kcpuid/kcpuid.c
@@ -324,6 +324,8 @@ static int parse_line(char *line)
 		str = NULL;
 	}
 	tokens[5] = strtok(str, "\n");
+	if (!tokens[5])
+		goto err_exit;
 
 	/* index/main-leaf */
 	index = strtoull(tokens[0], NULL, 0);
-- 
2.29.2