linux-kernel - Re: [PATCH 6.1 000/600] 6.1.53-rc1 review

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Date:   Tue, 12 Sep 2023 14:01:33 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Naresh Kamboju <naresh.kamboju@...aro.org>
Cc:     jack@...e.cz, stable@...r.kernel.org, patches@...ts.linux.dev,
        linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
        akpm@...ux-foundation.org, linux@...ck-us.net, shuah@...nel.org,
        patches@...nelci.org, lkft-triage@...ts.linaro.org, pavel@...x.de,
        jonathanh@...dia.com, f.fainelli@...il.com,
        sudipm.mukherjee@...il.com, srw@...dewatkins.net, rwarsow@....de,
        conor@...nel.org,
        Daniel Díaz <daniel.diaz@...aro.org>,
        Tom Rix <trix@...hat.com>,
        Nathan Chancellor <nathan@...nel.org>
Subject: Re: [PATCH 6.1 000/600] 6.1.53-rc1 review

On Tue, Sep 12, 2023 at 05:26:27PM +0530, Naresh Kamboju wrote:
> On Tue, 12 Sept 2023 at 16:02, Greg Kroah-Hartman
> <gregkh@...uxfoundation.org> wrote:
> >
> > On Tue, Sep 12, 2023 at 02:19:34PM +0530, Naresh Kamboju wrote:
> > > On Tue, 12 Sept 2023 at 07:55, Daniel Díaz <daniel.diaz@...aro.org> wrote:
> > > >
> > > > Hello!
> > > >
> > > > On Mon, 11 Sept 2023 at 14:58, Daniel Díaz <daniel.diaz@...aro.org> wrote:
> > > > > On 11/09/23 7:40 a. m., Greg Kroah-Hartman wrote:
> > > > > > This is the start of the stable review cycle for the 6.1.53 release.
> > > > > > There are 600 patches in this series, all will be posted as a response
> > > > > > to this one.  If anyone has any issues with these being applied, please
> > > > > > let me know.
> > > > > >
> > > > > > Responses should be made by Wed, 13 Sep 2023 13:44:56 +0000.
> > > > > > Anything received after that time might be too late.
> > > > > >
> > > > > > The whole patch series can be found in one patch at:
> > > > > >       https://www.kernel.org/pub/linux/kernel/v6.x/stable-review/patch-6.1.53-rc1.gz
> > > > > > or in the git tree and branch at:
> > > > > >       git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-6.1.y
> > > > > > and the diffstat can be found below.
> > > > > >
> > > > > > thanks,
> > > > > >
> > > > > > greg k-h
> > > > >
> > > > > We're seeing this new warning:
> > > > > -----8<-----
> > > > >    /builds/linux/fs/udf/inode.c:892:6: warning: variable 'newblock' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
> > > > >      892 |         if (*err < 0)
> > > > >          |             ^~~~~~~~
> > > > >    /builds/linux/fs/udf/inode.c:914:9: note: uninitialized use occurs here
> > > > >      914 |         return newblock;
> > > > >          |                ^~~~~~~~
> > > > >    /builds/linux/fs/udf/inode.c:892:2: note: remove the 'if' if its condition is always false
> > > > >      892 |         if (*err < 0)
> > > > >          |         ^~~~~~~~~~~~~
> > > > >      893 |                 goto out_free;
> > > > >          |                 ~~~~~~~~~~~~~
> > > > >    /builds/linux/fs/udf/inode.c:699:34: note: initialize the variable 'newblock' to silence this warning
> > > > >      699 |         udf_pblk_t newblocknum, newblock;
> > > > >          |                                         ^
> > > > >          |                                          = 0
> > > > >    1 warning generated.
> > > > > ----->8-----
> > > > >
> > > > > That's with Clang 17 (and nightly) on:
> > > > > * arm
> > > > > * powerpc
> > > > > * s390
> > > >
> > > > For what it's worth, bisection points to 903b487b5ba6 ("udf: Handle
> > > > error when adding extent to a file").
> > >
> > > I see the following commit is fixing the reported problem.
> > >
> > > commit 6d5ab7c2f7cf90877dab8f2bb06eb5ca8edc73ef
> > > Author: Tom Rix <trix@...hat.com>
> > > Date:   Fri Dec 30 12:53:41 2022 -0500
> > >
> > >     udf: initialize newblock to 0
> > >
> > >     The clang build reports this error
> > >     fs/udf/inode.c:805:6: error: variable 'newblock' is used
> > > uninitialized whenever 'if' condition is true
> > > [-Werror,-Wsometimes-uninitialized]
> > >             if (*err < 0)
> > >                 ^~~~~~~~
> > >     newblock is never set before error handling jump.
> > >     Initialize newblock to 0 and remove redundant settings.
> > >
> > >     Fixes: d8b39db5fab8 ("udf: Handle error when adding extent to a file")
> > >     Reported-by: Nathan Chancellor <nathan@...nel.org>
> > >     Signed-off-by: Tom Rix <trix@...hat.com>
> > >     Signed-off-by: Jan Kara <jack@...e.cz>
> > >     Message-Id: <20221230175341.1629734-1-trix@...hat.com>
> >
> > Wait, where is this commit?  I don't see it in Linus's tree either, nor
> > in linux-next.  Where did you find it?
> 
> Can you find this commit id ?
> 
> Commit id: 23970a1c9475b305770fd37bebfec7a10f263787
> subject: ("udf: initialize newblock to 0")

Yes, that is in 6.2.  Where did the id you used above come from?

confused,

greg k-h