linux-kernel - Re: [PATCH v2] s390: Fix strrchr() implementation

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Message-ID: <YVxU5fNTpFt/P0wk@osiris>
Date:   Tue, 5 Oct 2021 15:36:37 +0200
From:   Heiko Carstens <hca@...ux.ibm.com>
To:     Roberto Sassu <roberto.sassu@...wei.com>
Cc:     Juergen Gross <jgross@...e.com>,
        "gor@...ux.ibm.com" <gor@...ux.ibm.com>,
        "borntraeger@...ibm.com" <borntraeger@...ibm.com>,
        "linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH v2] s390: Fix strrchr() implementation

On Tue, Oct 05, 2021 at 01:30:45PM +0000, Roberto Sassu wrote:
> > From: Juergen Gross [mailto:jgross@...e.com]
> > Sent: Tuesday, October 5, 2021 3:25 PM
> > On 05.10.21 15:14, Heiko Carstens wrote:
> > > On Tue, Oct 05, 2021 at 02:08:36PM +0200, Roberto Sassu wrote:
> > >> Fix two problems found in the strrchr() implementation for s390
> > >> architectures: evaluate empty strings (return the string address instead of
> > >> NULL, if '\0' is passed as second argument); evaluate the first character
> > >> of non-empty strings (the current implementation stops at the second).
> > >>
> > >> Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
> > >> Cc: stable@...r.kernel.org
> > >> Reported-by: Heiko Carstens <hca@...ux.ibm.com> (incorrect behavior with
> > empty strings)
> > >> Signed-off-by: Roberto Sassu <roberto.sassu@...wei.com>
> > >> ---
> > >>   arch/s390/lib/string.c | 15 +++++++--------
> > >>   1 file changed, 7 insertions(+), 8 deletions(-)
> > >
> > > Applied, thanks!
> > >
> > 
> > Really? I just wanted to write a response: len is unsigned (size_t)
> > and compared to be >= 0, which sounds like always true.
> 
> Thanks for catching this. Will fix it.

I'll fix it. No need to resend.