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scsi-disk: Bound check read-blocks 

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Benjamin Herrenschmidt 2013-06-27 18:38:01 +10:00
parent a498136b51
commit 48eec205c1
1 changed files with 12 additions and 0 deletions
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12
slof/fs/scsi-disk.fs
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@ -66,6 +66,18 @@ CREATE cdb 10 allot
scsi-disk-debug? IF scsi-disk-debug? IF
." SCSI-DISK: read-blocks " .s cr ." SCSI-DISK: read-blocks " .s cr
THEN THEN
\ Bound check. This should probably be done by deblocker
\ but it doesn't at this point so do it here
2dup + max-block-num > IF
." SCSI-DISK: Access beyond end of device ! " cr
drop
dup max-block-num > IF
drop drop 0 EXIT
THEN
dup max-block-num swap -
THEN
dup block-size * ( addr block# #blocks len ) dup block-size * ( addr block# #blocks len )
>r rot r> ( block# #blocks addr len ) >r rot r> ( block# #blocks addr len )
2swap ( addr len block# #blocks ) 2swap ( addr len block# #blocks )