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target: Check number of unmap descriptors against our limit 

Fail UNMAP commands that have more than our reported limit on unmap
descriptors.

Signed-off-by: Roland Dreier <roland@purestorage.com>
Cc: stable@vger.kernel.org
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Roland Dreier 2012-07-16 15:34:25 -07:00 committed by Nicholas Bellinger
parent b7fc7f3777
commit 7409a6657a
1 changed files with 5 additions and 0 deletions
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5
drivers/target/target_core_iblock.c
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@ -336,6 +336,11 @@ static int iblock_execute_unmap(struct se_cmd *cmd)
bd_dl = get_unaligned_be16(&buf[2]);
size = min(size - 8, bd_dl);
if (size / 16 > dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count) {
cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
ret = -EINVAL;
goto err;
}
/* First UNMAP block descriptor starts at 8 byte offset */
ptr = &buf[8];