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mtd: docg3 fix inbound calculations

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The last erase block was not accessible, as the out of bound
check was incorrectly rejecting the last block.
The read/write/erase offset checks were forbidding the usage of the
last block, because of the calculation which was considering the
byte after the last instead of the last byte.

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Robert Jarzmik 2012-03-22 21:00:50 +01:00 committed by David Woodhouse
parent a78da28776
commit a7baef1211
1 changed files with 5 additions and 12 deletions
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17
drivers/mtd/devices/docg3.c
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@ -872,11 +872,8 @@ static int doc_read_oob(struct mtd_info *mtd, loff_t from,
if (ooblen % DOC_LAYOUT_OOB_SIZE)
return -EINVAL;
ret = -EINVAL;
calc_block_sector(from + len, &block0, &block1, &page, &ofs,
docg3->reliable);
if (block1 > docg3->max_block)
goto err;
if (from + len > mtd->size)
return -EINVAL;
ops->oobretlen = 0;
ops->retlen = 0;
@ -1207,7 +1204,7 @@ static int doc_erase(struct mtd_info *mtd, struct erase_info *info)
calc_block_sector(info->addr + info->len, &block0, &block1, &page,
&ofs, docg3->reliable);
ret = -EINVAL;
if (block1 > docg3->max_block || page || ofs)
if (info->addr + info->len > mtd->size || page || ofs)
goto reset_err;
ret = 0;
@ -1443,12 +1440,8 @@ static int doc_write_oob(struct mtd_info *mtd, loff_t ofs,
if (len && ooblen &&
(len / DOC_LAYOUT_PAGE_SIZE) != (ooblen / oobdelta))
return -EINVAL;
ret = -EINVAL;
calc_block_sector(ofs + len, &block0, &block1, &page, &pofs,
docg3->reliable);
if (block1 > docg3->max_block)
goto err;
if (ofs + len > mtd->size)
return -EINVAL;
ops->oobretlen = 0;
ops->retlen = 0;