linux-kernel - Re: [PATCH 12/16] x86/microcode/AMD: Fix container size's type

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Message-ID: <201811110436.ppUT9LcR%fengguang.wu@intel.com>
Date:   Sun, 11 Nov 2018 04:59:52 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     kbuild-all@...org, X86 ML <x86@...nel.org>,
        "Maciej S . Szmigiero" <mail@...iej.szmigiero.name>,
        Tom Lendacky <thomas.lendacky@....com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 12/16] x86/microcode/AMD: Fix container size's type

Hi Borislav,

I love your patch! Perhaps something to improve:

[auto build test WARNING on tip/x86/core]
[also build test WARNING on v4.20-rc1 next-20181109]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Borislav-Petkov/x86-microcode-AMD-Improve-container-verification/20181109-065233

smatch warnings:
arch/x86/kernel/cpu/microcode/amd.c:368 scan_containers() warn: always true condition '(size >= 0) => (0-u32max >= 0)'
arch/x86/kernel/cpu/microcode/amd.c:368 scan_containers() warn: always true condition '(size >= 0) => (0-u32max >= 0)'

vim +368 arch/x86/kernel/cpu/microcode/amd.c

   361	
   362	/*
   363	 * Scan the ucode blob for the proper container as we can have multiple
   364	 * containers glued together.
   365	 */
   366	static void scan_containers(u8 *ucode, size_t size, struct cont_desc *desc)
   367	{
 > 368		while (size >= 0) {
   369			size_t s = parse_container(ucode, size, desc);
   370			if (!s)
   371				return;
   372	
   373			/* catch wraparound */
   374			if (size >= s) {
   375				ucode += s;
   376				size  -= s;
   377			} else
   378				return;
   379		}
   380	}
   381	

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