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hfsplus: fix overflow in hfsplus_read_wrapper

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For partitions larger than 2TB or at such an offset the hfs wrapper code
in hfsplus might overflow the range representable in a 32-bit
data type. Make sure we use a sector_t for the arithmetics leading to it.

I'm not sure this code can be readed at all as hfs itself never supported
such large volumes.

Signed-off-by: Christoph Hellwig <hch@tuxera.com>
This commit is contained in:
Christoph Hellwig 2011-02-16 09:34:22 +01:00 committed by Christoph Hellwig
parent bf1a1b31fa
commit 4ba2d5fdcf
1 changed files with 3 additions and 2 deletions
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5
fs/hfsplus/wrapper.c
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@ -172,8 +172,9 @@ int hfsplus_read_wrapper(struct super_block *sb)
if (!hfsplus_read_mdb(sbi->s_vhdr, &wd))
goto out_free_backup_vhdr;
wd.ablk_size >>= HFSPLUS_SECTOR_SHIFT;
part_start += wd.ablk_start + wd.embed_start * wd.ablk_size;
part_size = wd.embed_count * wd.ablk_size;
part_start += (sector_t)wd.ablk_start +
(sector_t)wd.embed_start * wd.ablk_size;
part_size = (sector_t)wd.embed_count * wd.ablk_size;
goto reread;
default:
/*