linux-kernel - [PATCH 04/11] target: support zero-size allocation lengths in transport_kmap_data

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Date:	Fri,  7 Sep 2012 17:30:35 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	target-devel@...r.kernel.org, nab@...ux-iscsi.org, hch@....de,
	roland@...nel.org
Subject: [PATCH 04/11] target: support zero-size allocation lengths in transport_kmap_data_sg

In order to support zero-size allocation lengths, do not assert
that we have a scatterlist until after checking cmd->data_length.

But once we do this, we can have two cases of transport_kmap_data_sg
returning NULL: a zero-size allocation length, or an out-of-memory
condition.  Report the latter using sense codes, so that the SCSI
command that triggered it will fail.

Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
---
 drivers/target/target_core_transport.c |   13 +++++++++----
 1 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index 2e55aa9..8facb74 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -2185,7 +2185,6 @@ void *transport_kmap_data_sg(struct se_cmd *cmd)
 	struct page **pages;
 	int i;
 
-	BUG_ON(!sg);
 	/*
 	 * We need to take into account a possible offset here for fabrics like
 	 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
@@ -2193,13 +2192,17 @@ void *transport_kmap_data_sg(struct se_cmd *cmd)
 	 */
 	if (!cmd->t_data_nents)
 		return NULL;
-	else if (cmd->t_data_nents == 1)
+
+	BUG_ON(!sg);
+	if (cmd->t_data_nents == 1)
 		return kmap(sg_page(sg)) + sg->offset;
 
 	/* >1 page. use vmap */
 	pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
-	if (!pages)
+	if (!pages) {
+		cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 		return NULL;
+	}
 
 	/* convert sg[] to pages[] */
 	for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
@@ -2208,8 +2211,10 @@ void *transport_kmap_data_sg(struct se_cmd *cmd)
 
 	cmd->t_data_vmap = vmap(pages, cmd->t_data_nents,  VM_MAP, PAGE_KERNEL);
 	kfree(pages);
-	if (!cmd->t_data_vmap)
+	if (!cmd->t_data_vmap) {
+		cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 		return NULL;
+	}
 
 	return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
 }
-- 
1.7.1


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