Hi Michael, On Fri, Oct 12, 2018 at 2:27 AM Michael Schmitz <schmitzmic@xxxxxxxxx> wrote: > The Amiga partition parser module uses signed int for partition sector > address and count, which will overflow for disks larger than 1 TB. > > Use sector_t as type for sector address and size to allow using disks > up to 2 TB without LBD support, and disks larger than 2 TB with LBD. > > This bug was reported originally in 2012, and the fix was created by > the RDB author, Joanne Dow <jdow@xxxxxxxxxxxxx>. A patch had been > discussed and reviewed on linux-m68k at that time but never officially > submitted. This patch differs from Joanne's patch only in its use of > sector_t instead of unsigned int. No checking for overflows is done > (see patch 2 of this series for that). > > Fixes: https://bugzilla.kernel.org/show_bug.cgi?id=43511 > Reported-by: Martin Steigerwald <Martin@xxxxxxxxxxxx> > Message-ID: <201206192146.09327.Martin@xxxxxxxxxxxx> > Signed-off-by: Michael Schmitz <schmitzmic@xxxxxxxxx> > Tested-by: Martin Steigerwald <Martin@xxxxxxxxxxxx> Thanks for your patch! > Changes from v4: > > Andreas Schwab: > - correct cast to sector_t in sector address calculations Which you only did for the first case... > --- a/block/partitions/amiga.c > +++ b/block/partitions/amiga.c > @@ -100,14 +101,14 @@ int amiga_partition(struct parsed_partitions *state) > > /* Tell Kernel about it */ > > - nr_sects = (be32_to_cpu(pb->pb_Environment[10]) + 1 - > - be32_to_cpu(pb->pb_Environment[9])) * > + nr_sects = ((sector_t) be32_to_cpu(pb->pb_Environment[10]) ...here ... > + + 1 - be32_to_cpu(pb->pb_Environment[9])) * > be32_to_cpu(pb->pb_Environment[3]) * > be32_to_cpu(pb->pb_Environment[5]) * > blksize; > if (!nr_sects) > continue; > - start_sect = be32_to_cpu(pb->pb_Environment[9]) * > + start_sect = (sector_t) be32_to_cpu(pb->pb_Environment[9]) * ... but not here? > be32_to_cpu(pb->pb_Environment[3]) * > be32_to_cpu(pb->pb_Environment[5]) * > blksize; Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds
