From 01cde4d54327884a0b61ce8666092f5703557d4b Mon Sep 17 00:00:00 2001 From: Nicholas Bellinger Date: Wed, 10 Aug 2011 00:59:58 -0700 Subject: target: Add missing DATA_SG_IO transport_cmd_get_valid_sectors check This patch adds the missing transport_cmd_get_valid_sectors() check for SCF_SCSI_DATA_SG_IO_CDB type payloads to ensure that a received LBA + range does not exeed past the end of associated backend struct se_device. This patch also fixes a bug in the failure path of transport_new_cmd_obj() where this check can fail, so change to use a signed 'rc' and return '-EINVAL' to signal proper transport_generic_request_failure() handling. Signed-off-by: Nicholas Bellinger --- drivers/target/target_core_transport.c | 15 ++++++++------- 1 file changed, 8 insertions(+), 7 deletions(-) (limited to 'drivers/target') diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c index d385c317a7a4..ab61c5550852 100644 --- a/drivers/target/target_core_transport.c +++ b/drivers/target/target_core_transport.c @@ -3891,9 +3891,7 @@ EXPORT_SYMBOL(transport_generic_map_mem_to_cmd); static int transport_new_cmd_obj(struct se_cmd *cmd) { struct se_device *dev = cmd->se_dev; - u32 task_cdbs; - u32 rc; - int set_counts = 1; + int set_counts = 1, rc, task_cdbs; /* * Setup any BIDI READ tasks and memory from @@ -3911,7 +3909,7 @@ static int transport_new_cmd_obj(struct se_cmd *cmd) cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; - return PYX_TRANSPORT_LU_COMM_FAILURE; + return -EINVAL; } atomic_inc(&cmd->t_fe_count); atomic_inc(&cmd->t_se_count); @@ -3930,7 +3928,7 @@ static int transport_new_cmd_obj(struct se_cmd *cmd) cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; - return PYX_TRANSPORT_LU_COMM_FAILURE; + return -EINVAL; } if (set_counts) { @@ -4248,10 +4246,13 @@ static u32 transport_allocate_tasks( struct scatterlist *sgl, unsigned int sgl_nents) { - if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) + if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) { + if (transport_cmd_get_valid_sectors(cmd) < 0) + return -EINVAL; + return transport_allocate_data_tasks(cmd, lba, data_direction, sgl, sgl_nents); - else + } else return transport_allocate_control_task(cmd); } -- cgit v1.2.1