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target/pscsi: Fix bug with REPORT_LUNs handling for SCSI passthrough

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This patch fixes a regression bug in pscsi_transport_complete() callback
code where *pt was being NULL dereferenced during REPORT_LUNS handling,
that was introduced with the spc/sbc refactoring in:

commit 1fd032ee10
Author: Christoph Hellwig <hch@infradead.org>
Date:   Sun May 20 11:59:15 2012 -0400

    target: move code for CDB emulation

As this is a special case for pscsi_parse_cdb() to call spc_parse_cdb() to
allow TCM to handle REPORT_LUN emulation, pscsi_plugin_task will have not
been allocated..

So now in pscsi_transport_complete() just check for existence of *pt and
return for this special case.

Reported-by: Alex Elsayed <eternaleye+usenet@gmail.com>
Cc: Alex Elsayed <eternaleye+usenet@gmail.com>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Nicholas Bellinger 2012-08-08 00:14:13 +00:00
parent 5b7517f814
commit 1d2a2cd95e
1 changed files with 8 additions and 1 deletions
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9
drivers/target/target_core_pscsi.c
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@ -673,8 +673,15 @@ static int pscsi_transport_complete(struct se_cmd *cmd, struct scatterlist *sg)
struct scsi_device *sd = pdv->pdv_sd;
int result;
struct pscsi_plugin_task *pt = cmd->priv;
unsigned char *cdb = &pt->pscsi_cdb[0];
unsigned char *cdb;
/*
* Special case for REPORT_LUNs handling where pscsi_plugin_task has
* not been allocated because TCM is handling the emulation directly.
*/
if (!pt)
return 0;
cdb = &pt->pscsi_cdb[0];
result = pt->pscsi_result;
/*
* Hack to make sure that Write-Protect modepage is set if R/O mode is