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target: support zero allocation length in SBC commands

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READ CAPACITY must be subject to the same treatment as INQUIRY,
REQUEST SENSE, and MODE SENSE, but there are no pre-existing bugs
to fix here.  Just use an on-stack buffer, and copy to it after
checking the return value of transport_kmap_data_sg.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Paolo Bonzini 2012-09-07 17:30:40 +02:00 committed by Nicholas Bellinger
parent 7a3f369ce3
commit a50da144d0
1 changed files with 15 additions and 8 deletions
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23
drivers/target/target_core_sbc.c
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@ -40,8 +40,9 @@
static int sbc_emulate_readcapacity(struct se_cmd *cmd)
{
struct se_device *dev = cmd->se_dev;
unsigned char *buf;
unsigned long long blocks_long = dev->transport->get_blocks(dev);
unsigned char *rbuf;
unsigned char buf[8];
u32 blocks;
if (blocks_long >= 0x00000000ffffffff)
@ -49,8 +50,6 @@ static int sbc_emulate_readcapacity(struct se_cmd *cmd)
else
blocks = (u32)blocks_long;
buf = transport_kmap_data_sg(cmd);
buf[0] = (blocks >> 24) & 0xff;
buf[1] = (blocks >> 16) & 0xff;
buf[2] = (blocks >> 8) & 0xff;
@ -60,7 +59,11 @@ static int sbc_emulate_readcapacity(struct se_cmd *cmd)
buf[6] = (dev->se_sub_dev->se_dev_attrib.block_size >> 8) & 0xff;
buf[7] = dev->se_sub_dev->se_dev_attrib.block_size & 0xff;
transport_kunmap_data_sg(cmd);
rbuf = transport_kmap_data_sg(cmd);
if (rbuf) {
memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
transport_kunmap_data_sg(cmd);
}
target_complete_cmd(cmd, GOOD);
return 0;
@ -69,11 +72,11 @@ static int sbc_emulate_readcapacity(struct se_cmd *cmd)
static int sbc_emulate_readcapacity_16(struct se_cmd *cmd)
{
struct se_device *dev = cmd->se_dev;
unsigned char *buf;
unsigned char *rbuf;
unsigned char buf[32];
unsigned long long blocks = dev->transport->get_blocks(dev);
buf = transport_kmap_data_sg(cmd);
memset(buf, 0, sizeof(buf));
buf[0] = (blocks >> 56) & 0xff;
buf[1] = (blocks >> 48) & 0xff;
buf[2] = (blocks >> 40) & 0xff;
@ -93,7 +96,11 @@ static int sbc_emulate_readcapacity_16(struct se_cmd *cmd)
if (dev->se_sub_dev->se_dev_attrib.emulate_tpu || dev->se_sub_dev->se_dev_attrib.emulate_tpws)
buf[14] = 0x80;
transport_kunmap_data_sg(cmd);
rbuf = transport_kmap_data_sg(cmd);
if (rbuf) {
memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
transport_kunmap_data_sg(cmd);
}
target_complete_cmd(cmd, GOOD);
return 0;