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target: prevent NULL pointer dereference in target_report_luns

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transport_kmap_data_sg can return NULL.  I never saw this trigger, but
returning -ENOMEM seems better than a crash.  Also removes a pointless
case while at it.

Signed-off-by: Joern Engel <joern@logfs.org>
Cc: stable@vger.kernel.org
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Jörn Engel 2012-02-15 16:52:11 -05:00 committed by Nicholas Bellinger
parent 382436f880
commit 47f1b8803e
1 changed files with 3 additions and 1 deletions
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4
drivers/target/target_core_device.c
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@ -652,7 +652,9 @@ int target_report_luns(struct se_task *se_task)
unsigned char *buf;
u32 cdb_offset = 0, lun_count = 0, offset = 8, i;
buf = (unsigned char *) transport_kmap_data_sg(se_cmd);
buf = transport_kmap_data_sg(se_cmd);
if (!buf)
return -ENOMEM;
/*
* If no struct se_session pointer is present, this struct se_cmd is