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

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Message-ID: <923ea0761d4d45158acbd1347d9bb6b5@huawei.com>
Date:   Tue, 5 Oct 2021 13:30:45 +0000
From:   Roberto Sassu <roberto.sassu@...wei.com>
To:     Juergen Gross <jgross@...e.com>, Heiko Carstens <hca@...ux.ibm.com>
CC:     "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

> 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.

Roberto

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