mtd: docg3 fix inbound calculations
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>
diff --git a/drivers/mtd/devices/docg3.c b/drivers/mtd/devices/docg3.c
index f5930ca..62e0111 100644
--- a/drivers/mtd/devices/docg3.c
+++ b/drivers/mtd/devices/docg3.c
@@ -872,11 +872,8 @@
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 @@
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 @@
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;