From: Nicholas Bellinger <nab@linux-iscsi.org>
Date: Wed, 16 Nov 2011 06:13:24 +0000 (-0800)
Subject: target: Reject SCSI data overflow for fabrics using transport_generic_map_mem_to_cmd
X-Git-Tag: v3.2-rc5~31^2~13
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fef58a6096770ed6ab49103a430cc755254a74d9;p=pandora-kernel.git

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>
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