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authorNicholas Bellinger <nab@linux-iscsi.org>2015-03-05 03:28:24 +0000
committerNicholas Bellinger <nab@linux-iscsi.org>2015-03-19 23:26:44 -0700
commit5f7da044f8bc1cfb21c962edf34bd5699a76e7ae (patch)
treedfc0f05b41de7359dd2d6099a498b91a8f3334d5
parent215a8fe4198f607f34ecdbc9969dae783d8b5a61 (diff)
downloadlinux-sh-5f7da044f8bc1cfb21c962edf34bd5699a76e7ae.tar.gz
target: Fix virtual LUN=0 target_configure_device failure OOPs
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@daterainc.com> Cc: Claudio Fleiner <cmf@daterainc.com> Cc: Christoph Hellwig <hch@lst.de> Cc: <stable@vger.kernel.org> # v3.7+ Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
-rw-r--r--drivers/target/target_core_device.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/target/target_core_device.c b/drivers/target/target_core_device.c
index 37449bdd62f6..7fc5eae875de 100644
--- a/drivers/target/target_core_device.c
+++ b/drivers/target/target_core_device.c
@@ -1548,8 +1548,6 @@ int target_configure_device(struct se_device *dev)
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..
*/
@@ -1611,6 +1609,8 @@ int target_configure_device(struct se_device *dev)
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: