target: Reject SCSI data overflow for fabrics using transport_generic_map_mem_to_cmd

This patch changes transport_generic_map_mem_to_cmd() to reject SCSI data
overflow and to send exception status with CHECK_CONDITION + TCM_INVALID_CDB_FIELD
for fabrics that are passing a pre-populated struct scatterlist (eg: tcm_loop
and iscsi-target) being mapped into se_cmd->t_data_sg and se_cmd->t_data_nents.

This addresses an OOPs where transport_allocate_data_tasks() would walk
the incorrect post OVERFLOW cmd->data_length value beyond the end of
the passed scatterlist.

Cc: Christoph Hellwig <hch@lst.de>
Cc: Andy Grover <agrover@redhat.com>
Cc: stable@kernel.org
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index 8f29f47..0bdb6ba 100644 (file)
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -3411,6 +3411,18 @@ int transport_generic_map_mem_to_cmd(
 
        if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
            (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
+               /*
+                * Reject SCSI data overflow with map_mem_to_cmd() as incoming
+                * scatterlists already have been set to follow what the fabric
+                * passes for the original expected data transfer length.
+                */
+               if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
+                       pr_warn("Rejecting SCSI DATA overflow for fabric using"
+                               " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
+                       cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
+                       cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
+                       return -EINVAL;
+               }
 
                cmd->t_data_sg = sgl;
                cmd->t_data_nents = sgl_count;