[PATCH 3.19 121/123] target: Fix virtual LUN=0 target_configure_device failure OOPs

From: Greg Kroah-Hartman
Date: Tue Mar 24 2015 - 13:12:19 EST


3.19-stable review patch. If anyone has any objections, please let me know.

------------------

From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>

commit 5f7da044f8bc1cfb21c962edf34bd5699a76e7ae upstream.

This patch fixes a NULL pointer dereference triggered by a late
target_configure_device() -> alloc_workqueue() failure that results
in target_free_device() being called with DF_CONFIGURED already set,
which subsequently OOPses in destroy_workqueue() code.

Currently this only happens at modprobe target_core_mod time when
core_dev_setup_virtual_lun0() -> target_configure_device() fails,
and the explicit target_free_device() gets called.

To address this bug originally introduced by commit 0fd97ccf45, go
ahead and move DF_CONFIGURED to end of target_configure_device()
code to handle this special failure case.

Reported-by: Claudio Fleiner <cmf@xxxxxxxxxxxxx>
Cc: Claudio Fleiner <cmf@xxxxxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
drivers/target/target_core_device.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/target/target_core_device.c
+++ b/drivers/target/target_core_device.c
@@ -1534,8 +1534,6 @@ int target_configure_device(struct se_de
ret = dev->transport->configure_device(dev);
if (ret)
goto out;
- dev->dev_flags |= DF_CONFIGURED;
-
/*
* XXX: there is not much point to have two different values here..
*/
@@ -1597,6 +1595,8 @@ int target_configure_device(struct se_de
list_add_tail(&dev->g_dev_node, &g_device_list);
mutex_unlock(&g_device_mutex);

+ dev->dev_flags |= DF_CONFIGURED;
+
return 0;

out_free_alua:


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