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target: Fix parameter list length checking in MODE SELECT 

An empty parameter list (length == 0) is not an error, so succeed MODE
SELECT in this case.  If the parameter list length is too small,
return the correct sense code of PARAMETER LIST LENGTH ERROR.

Signed-off-by: Roland Dreier <roland@purestorage.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Roland Dreier 2013-02-08 15:18:40 -08:00 committed by Nicholas Bellinger
parent bb992e72f9
commit 71f41fe1fa
1 changed files with 13 additions and 0 deletions
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13
drivers/target/target_core_spc.c
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@ -1000,6 +1000,14 @@ static sense_reason_t spc_emulate_modeselect(struct se_cmd *cmd)
int ret = 0;
int i;
if (!cmd->data_length) {
target_complete_cmd(cmd, GOOD);
return 0;
}
if (cmd->data_length < off + 2)
return TCM_PARAMETER_LIST_LENGTH_ERROR;
buf = transport_kmap_data_sg(cmd);
if (!buf)
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
@ -1024,6 +1032,11 @@ static sense_reason_t spc_emulate_modeselect(struct se_cmd *cmd)
goto out;
check_contents:
if (cmd->data_length < off + length) {
ret = TCM_PARAMETER_LIST_LENGTH_ERROR;
goto out;
}
if (memcmp(buf + off, tbuf, length))
ret = TCM_INVALID_PARAMETER_LIST;