diff options
| author | Hannes Reinecke <hare@suse.de> | 2013-12-19 14:36:11 +0100 |
|---|---|---|
| committer | Nicholas Bellinger <nab@linux-iscsi.org> | 2014-01-09 21:48:38 -0800 |
| commit | 38edd724577123c972f2264382005ac910ce747f (patch) | |
| tree | 1fb950f227ff91001504c29bce32b3c9415d8352 /drivers/target | |
| parent | 594c42e9bd9f70a41bf79236db985ba940d28eb8 (diff) | |
| download | op-kernel-dev-38edd724577123c972f2264382005ac910ce747f.zip op-kernel-dev-38edd724577123c972f2264382005ac910ce747f.tar.gz | |
target_core_alua: check for buffer overflow
When a writing to a command-provided buffer we need to ensure
that we're not writing past the end of it.
At the same time we need to continue processing as typically
the final data length (ie the required size of the buffer)
need to be returned.
Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'drivers/target')
| -rw-r--r-- | drivers/target/target_core_alua.c | 23 |
1 files changed, 17 insertions, 6 deletions
diff --git a/drivers/target/target_core_alua.c b/drivers/target/target_core_alua.c index e73edca..12da9b38 100644 --- a/drivers/target/target_core_alua.c +++ b/drivers/target/target_core_alua.c @@ -96,22 +96,33 @@ target_emulate_report_referrals(struct se_cmd *cmd) int pg_num; off += 4; - put_unaligned_be64(map->lba_map_first_lba, &buf[off]); + if (cmd->data_length > off) + put_unaligned_be64(map->lba_map_first_lba, &buf[off]); off += 8; - put_unaligned_be64(map->lba_map_last_lba, &buf[off]); + if (cmd->data_length > off) + put_unaligned_be64(map->lba_map_last_lba, &buf[off]); off += 8; rd_len += 20; pg_num = 0; list_for_each_entry(map_mem, &map->lba_map_mem_list, lba_map_mem_list) { - buf[off++] = map_mem->lba_map_mem_alua_state & 0x0f; + int alua_state = map_mem->lba_map_mem_alua_state; + int alua_pg_id = map_mem->lba_map_mem_alua_pg_id; + + if (cmd->data_length > off) + buf[off] = alua_state & 0x0f; + off += 2; + if (cmd->data_length > off) + buf[off] = (alua_pg_id >> 8) & 0xff; + off++; + if (cmd->data_length > off) + buf[off] = (alua_pg_id & 0xff); off++; - buf[off++] = (map_mem->lba_map_mem_alua_pg_id >> 8) & 0xff; - buf[off++] = (map_mem->lba_map_mem_alua_pg_id & 0xff); rd_len += 4; pg_num++; } - buf[desc_num] = pg_num; + if (cmd->data_length > desc_num) + buf[desc_num] = pg_num; } spin_unlock(&dev->t10_alua.lba_map_lock); |
