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Date: Sun, 10 May 2020 08:14:22 +0200 From: Greg KH <gregkh@...uxfoundation.org> To: Chen Zhou <chenzhou10@...wei.com> Cc: linux@...linux.org.uk, alexios.zavras@...el.com, tglx@...utronix.de, allison@...utok.net, linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH -next] arch/arm: use scnprintf() in l2x0_pmu_event_show() On Sat, May 09, 2020 at 04:35:39PM +0800, Chen Zhou wrote: > snprintf() returns the number of bytes that would be written, > which may be greater than the the actual length to be written. > > show() methods should return the number of bytes printed into the > buffer. This is the return value of scnprintf(). > > Signed-off-by: Chen Zhou <chenzhou10@...wei.com> > --- > arch/arm/mm/cache-l2x0-pmu.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/arch/arm/mm/cache-l2x0-pmu.c b/arch/arm/mm/cache-l2x0-pmu.c > index 993fefdc167a..d20626451a2e 100644 > --- a/arch/arm/mm/cache-l2x0-pmu.c > +++ b/arch/arm/mm/cache-l2x0-pmu.c > @@ -343,7 +343,7 @@ static ssize_t l2x0_pmu_event_show(struct device *dev, > struct l2x0_event_attribute *lattr; > > lattr = container_of(attr, typeof(*lattr), attr); > - return snprintf(buf, PAGE_SIZE, "config=0x%x\n", lattr->config); > + return scnprintf(buf, PAGE_SIZE, "config=0x%x\n", lattr->config); This should just be replaced with sprintf() as there's no way such a string can go beyond PAGE_SIZE. And the "config=" part could be dropped as well, but now userspace probably requires it, that is sad. thanks, greg k-h
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