Re: [PATCH] make kernel ignore bogus partitions

[Mike Miller (OS Dev)]

On Tue, May 09, 2006 at 12:41:38PM -0700, Andrew Morton wrote:
> "Mike Miller (OS Dev)" <mikem@xxxxxxxxxxxxxxxxxxxxxxx> wrote:
> >
> > Patch 1/1
> > Sometimes partitions claim to be larger than the reported capacity of a
> > disk device. This patch makes the kernel ignore those partitions.
> > 
> > Signed-off-by: Mike Miller <mike.miller@xxxxxx>
> > Signed-off-by: Stephen Cameron <steve.cameron@xxxxxx>
> > 
> > Please consider this for inclusion.
> > 
> > 
> >  fs/partitions/check.c |    5 +++++
> >  1 files changed, 5 insertions(+)
> > 
> > --- linux-2.6.14/fs/partitions/check.c~partition_vs_capacity	2006-01-06 09:32:14.000000000 -0600
> > +++ linux-2.6.14-root/fs/partitions/check.c	2006-01-06 11:24:50.000000000 -0600
> > @@ -382,6 +382,11 @@ int rescan_partitions(struct gendisk *di
> >  		sector_t from = state->parts[p].from;
> >  		if (!size)
> >  			continue;
> > +		if (from+size-1 > get_capacity(disk)) {
> > +			printk(" %s: p%d exceeds device capacity, ignoring.\n", 
> > +				disk->disk_name, p);
> > +			continue;
> > +		}
> >  		add_partition(disk, p, from, size);
> >  #ifdef CONFIG_BLK_DEV_MD
> >  		if (state->parts[p].flags)
> 
> Shouldn't that be
> 
> 	if (from+size > get_capacity(disk)) {
> 
> ?
> 
Since the partition size is 0-based this is correct:

	if (from+size-1 > get_capacity(disk)) {

mikem
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