summaryrefslogtreecommitdiffstats
path: root/drivers/target/target_core_cdb.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/target/target_core_cdb.c')
-rw-r--r--drivers/target/target_core_cdb.c43
1 files changed, 30 insertions, 13 deletions
diff --git a/drivers/target/target_core_cdb.c b/drivers/target/target_core_cdb.c
index 664f6e7..bf7d38a 100644
--- a/drivers/target/target_core_cdb.c
+++ b/drivers/target/target_core_cdb.c
@@ -1013,11 +1013,11 @@ int target_emulate_unmap(struct se_cmd *cmd)
{
struct se_device *dev = cmd->se_dev;
unsigned char *buf, *ptr = NULL;
- unsigned char *cdb = &cmd->t_task_cdb[0];
sector_t lba;
- unsigned int size = cmd->data_length, range;
- int ret = 0, offset;
- unsigned short dl, bd_dl;
+ int size = cmd->data_length;
+ u32 range;
+ int ret = 0;
+ int dl, bd_dl;
if (!dev->transport->do_discard) {
pr_err("UNMAP emulation not supported for: %s\n",
@@ -1026,24 +1026,41 @@ int target_emulate_unmap(struct se_cmd *cmd)
return -ENOSYS;
}
- /* First UNMAP block descriptor starts at 8 byte offset */
- offset = 8;
- size -= 8;
- dl = get_unaligned_be16(&cdb[0]);
- bd_dl = get_unaligned_be16(&cdb[2]);
-
buf = transport_kmap_data_sg(cmd);
- ptr = &buf[offset];
- pr_debug("UNMAP: Sub: %s Using dl: %hu bd_dl: %hu size: %hu"
+ dl = get_unaligned_be16(&buf[0]);
+ 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];
+ pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u"
" ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr);
- while (size) {
+ while (size >= 16) {
lba = get_unaligned_be64(&ptr[0]);
range = get_unaligned_be32(&ptr[8]);
pr_debug("UNMAP: Using lba: %llu and range: %u\n",
(unsigned long long)lba, range);
+ if (range > dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count) {
+ cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
+ ret = -EINVAL;
+ goto err;
+ }
+
+ if (lba + range > dev->transport->get_blocks(dev) + 1) {
+ cmd->scsi_sense_reason = TCM_ADDRESS_OUT_OF_RANGE;
+ ret = -EINVAL;
+ goto err;
+ }
+
ret = dev->transport->do_discard(dev, lba, range);
if (ret < 0) {
pr_err("blkdev_issue_discard() failed: %d\n",