On Fri, Oct 19, 2012 at 4:59 AM, Florian Fainelli <ffaine...@freebox.fr> wrote: > From: Maxime Bizon <mbi...@freebox.fr> > > record_size / console_size / ftrace_size can be 0 (this is how you > disable the feature), but rounddown_pow_of_two(0) is undefined. This problem > has been present since commit 1894a253 (ramoops: Move to fs/pstore/ram.c). > > Signed-off-by: Maxime Bizon <mbi...@freebox.fr> > Signed-off-by: Florian Fainelli <ffaine...@freebox.fr> > CC: sta...@vger.kernel.org > --- > fs/pstore/ram.c | 12 ++++++++---- > 1 file changed, 8 insertions(+), 4 deletions(-) > > diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c > index 1a4f6da..0c2ae26 100644 > --- a/fs/pstore/ram.c > +++ b/fs/pstore/ram.c > @@ -374,10 +374,14 @@ static int __devinit ramoops_probe(struct > platform_device *pdev) > goto fail_out; > } > > - pdata->mem_size = rounddown_pow_of_two(pdata->mem_size); > - pdata->record_size = rounddown_pow_of_two(pdata->record_size); > - pdata->console_size = rounddown_pow_of_two(pdata->console_size); > - pdata->ftrace_size = rounddown_pow_of_two(pdata->ftrace_size); > + if (pdata->mem_size) > + pdata->mem_size = rounddown_pow_of_two(pdata->mem_size);
Nice catch! Instead of the == 0 check, what about using !is_power_of_2(size) ? -Kees -- Kees Cook Chrome OS Security -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
