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[2001:1c00:c0c:fe00:d2ea:f29d:118b:24dc]) by smtp.gmail.com with ESMTPSA id b5sm13086528edq.69.2020.09.15.23.14.03 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 15 Sep 2020 23:14:03 -0700 (PDT) Subject: Re: [PATCH] vboxsf: fix comparison of signed char constant with unsigned char array elements To: Colin King , Christoph Hellwig , Al Viro , linux-fsdevel@vger.kernel.org Cc: kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org References: <20200915160336.36107-1-colin.king@canonical.com> From: Hans de Goede Message-ID: <65fbb23b-a533-aedb-75eb-69e1c53eaae9@redhat.com> Date: Wed, 16 Sep 2020 08:14:03 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20200915160336.36107-1-colin.king@canonical.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Hi, On 9/15/20 6:03 PM, Colin King wrote: > From: Colin Ian King > > The comparison of signed char constants with unsigned char array > elements leads to checks that are always false. Fix this by declaring > the VBSF_MOUNT_SIGNATURE_BYTE* macros as octal unsigned int constants > rather than as signed char constants. (Argueably the U is not necessarily > required, but add it to be really clear of intent). > > Addresses-Coverity: ("Operands don't affect result") > Fixes: 0fd169576648 ("fs: Add VirtualBox guest shared folder (vboxsf) support") > Signed-off-by: Colin Ian King A fix for this has already been queued up: https://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs.git/log/?h=fixes Explicit nack for this one, since it will still apply, but combined with the other fix, it will re-break things. Regards, Hans > --- > fs/vboxsf/super.c | 8 ++++---- > 1 file changed, 4 insertions(+), 4 deletions(-) > > diff --git a/fs/vboxsf/super.c b/fs/vboxsf/super.c > index 25aade344192..986efcb29cc2 100644 > --- a/fs/vboxsf/super.c > +++ b/fs/vboxsf/super.c > @@ -21,10 +21,10 @@ > > #define VBOXSF_SUPER_MAGIC 0x786f4256 /* 'VBox' little endian */ > > -#define VBSF_MOUNT_SIGNATURE_BYTE_0 ('\000') > -#define VBSF_MOUNT_SIGNATURE_BYTE_1 ('\377') > -#define VBSF_MOUNT_SIGNATURE_BYTE_2 ('\376') > -#define VBSF_MOUNT_SIGNATURE_BYTE_3 ('\375') > +#define VBSF_MOUNT_SIGNATURE_BYTE_0 0000U > +#define VBSF_MOUNT_SIGNATURE_BYTE_1 0377U > +#define VBSF_MOUNT_SIGNATURE_BYTE_2 0376U > +#define VBSF_MOUNT_SIGNATURE_BYTE_3 0375U > > static int follow_symlinks; > module_param(follow_symlinks, int, 0444); >