| From | Greg Kroah-Hartman <> | Subject | [PATCH 3.14 73/79] target: Fix virtual LUN=0 target_configure_device failure OOPs | Date | Tue, 24 Mar 2015 16:46:24 +0100 |
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3.14-stable review patch. If anyone has any objections, please let me know.
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From: Nicholas Bellinger <nab@linux-iscsi.org>
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@daterainc.com> Cc: Claudio Fleiner <cmf@daterainc.com> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- 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 @@ -1591,8 +1591,6 @@ 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.. */ @@ -1654,6 +1652,8 @@ 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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