diff options
| author | Jörn Engel <joern@logfs.org> | 2012-02-16 11:14:27 -0500 |
|---|---|---|
| committer | Nicholas Bellinger <nab@linux-iscsi.org> | 2012-02-25 14:37:50 -0800 |
| commit | 99f730d88fd0a25c3e2dfc357bde4cf6b8cb5b40 (patch) | |
| tree | 94b74e3bbceda90501e550543dfc82f0bde13917 | |
| parent | 47f1b8803e1e358ebbf4f82bfdb98971c912a2c3 (diff) | |
target: Fix off-by-seven in target_report_luns
cdb_offset is always equal to offset - 8, so remove that one. More
importantly, the existing code only worked correct if
se_cmd->data_length is a multiple of 8. Pass in a length of, say, 9 and
we will happily overwrite 7 bytes of "unallocated" memory.
Now, afaics this bug is currently harmless, as allocations will
implicitly be padded to multiples of 8 bytes. But depending on such a
fact wouldn't qualify as sound engineering practice.
Signed-off-by: Joern Engel <joern@logfs.org>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
| -rw-r--r-- | drivers/target/target_core_device.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/drivers/target/target_core_device.c b/drivers/target/target_core_device.c index 36fa75da085..5cfaa4b6da4 100644 --- a/drivers/target/target_core_device.c +++ b/drivers/target/target_core_device.c @@ -650,7 +650,7 @@ int target_report_luns(struct se_task *se_task) struct se_lun *se_lun; struct se_session *se_sess = se_cmd->se_sess; unsigned char *buf; - u32 cdb_offset = 0, lun_count = 0, offset = 8, i; + u32 lun_count = 0, offset = 8, i; buf = transport_kmap_data_sg(se_cmd); if (!buf) @@ -679,12 +679,11 @@ int target_report_luns(struct se_task *se_task) * See SPC2-R20 7.19. */ lun_count++; - if ((cdb_offset + 8) >= se_cmd->data_length) + if ((offset + 8) > se_cmd->data_length) continue; int_to_scsilun(deve->mapped_lun, (struct scsi_lun *)&buf[offset]); offset += 8; - cdb_offset += 8; } spin_unlock_irq(&se_sess->se_node_acl->device_list_lock); |