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

[Heiko Carstens]

On Tue, Oct 05, 2021 at 03:24:33PM +0200, Juergen Gross wrote:
> 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@xxxxxxxxxxxxxxx
> > > Reported-by: Heiko Carstens <hca@xxxxxxxxxxxxx> (incorrect behavior with empty strings)
> > > Signed-off-by: Roberto Sassu <roberto.sassu@xxxxxxxxxx>
> > > ---
> > >   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.

Yeah.. I did some out-of-tree tests, but of course using int instead
of unsigned int. However sparse complains also. So this wouldn't have
hit upstream.
Many thanks for pointing this out anyway!