linux-kernel - Re: [PATCH v2] nfsd: use correct format characters

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Date:   Thu, 17 Mar 2022 23:47:08 +0000
From:   Chuck Lever III <chuck.lever@...cle.com>
To:     Thomas Haynes <loghyr@...merspace.com>
CC:     Bill Wendling <morbo@...gle.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Linux NFS Mailing List <linux-nfs@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "llvm@...ts.linux.dev" <llvm@...ts.linux.dev>
Subject: Re: [PATCH v2] nfsd: use correct format characters



> On Mar 17, 2022, at 7:45 PM, Thomas Haynes <loghyr@...merspace.com> wrote:
> 
> 
> 
>> On Mar 17, 2022, at 11:42 AM, Bill Wendling <morbo@...gle.com> wrote:
>> 
>> [You don't often get email from morbo@...gle.com. Learn why this is important at http://aka.ms/LearnAboutSenderIdentification.]
>> 
>> When compiling with -Wformat, clang emits the following warnings:
>> 
>> fs/nfsd/flexfilelayout.c:120:27: warning: format specifies type 'unsigned
>> char' but the argument has type 'int' [-Wformat]
>>                         "%s.%hhu.%hhu", addr, port >> 8, port & 0xff);
>>                             ~~~~              ^~~~~~~~~
>>                             %d
>> fs/nfsd/flexfilelayout.c:120:38: warning: format specifies type 'unsigned
>> char' but the argument has type 'int' [-Wformat]
>>                         "%s.%hhu.%hhu", addr, port >> 8, port & 0xff);
>>                                  ~~~~                    ^~~~~~~~~~~
>>                                  %d
>> 
>> The types of these arguments are unconditionally defined, so this patch
>> updates the format character to the correct ones for ints and unsigned
>> ints.
>> 
>> Link: https://github.com/ClangBuiltLinux/linux/issues/378
>> Signed-off-by: Bill Wendling <morbo@...gle.com>
>> ---
>> v2 - Fixed "Link" to be a valid URL.
>> ---
>> fs/nfsd/flexfilelayout.c | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>> 
>> diff --git a/fs/nfsd/flexfilelayout.c b/fs/nfsd/flexfilelayout.c
>> index 2e2f1d5e9f62..070f90ed09b6 100644
>> --- a/fs/nfsd/flexfilelayout.c
>> +++ b/fs/nfsd/flexfilelayout.c
>> @@ -117,7 +117,7 @@ nfsd4_ff_proc_getdeviceinfo(struct super_block *sb, struct svc_rqst *rqstp,
>> 
>>        da->netaddr.addr_len =
>>                snprintf(da->netaddr.addr, FF_ADDR_LEN + 1,
>> -                        "%s.%hhu.%hhu", addr, port >> 8, port & 0xff);
>> +                        "%s.%d.%d", addr, port >> 8, port & 0xff);
>> 
>>        da->tightly_coupled = false;
>> 
>> --
>> 2.35.1.723.g4982287a31-goog
>> 
> 
> 
> Reviewed-by: Tom Haynes <loghyr@...merspace.com>

Perfect, thanks!

--
Chuck Lever