commit: 47f1b8803e1e358ebbf4f82bfdb98971c912a2c3
From: =?UTF-8?q?J=C3=B6rn=20Engel?= <[email protected]>
Date: Wed, 15 Feb 2012 16:52:11 -0500
Subject: target: prevent NULL pointer dereference in target_report_luns

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 <[email protected]>
Cc: [email protected]
Signed-off-by: Nicholas Bellinger <[email protected]>
---
 drivers/target/target_core_device.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/drivers/target/target_core_device.c 
b/drivers/target/target_core_device.c
index b0572f4..36fa75d 100644
--- a/drivers/target/target_core_device.c
+++ b/drivers/target/target_core_device.c
@@ -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
-- 
1.7.3.4
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