From: Jacob Keller jacob.e.keller@intel.com
[ Upstream commit a2f054c10bef0b54600ec9cb776508443e941343 ]
In iavf_adminq_task(), if kzalloc() fails to allocate the event.msg_buf, the function will exit without releasing the adapter->crit_lock.
This is unlikely, but if it happens, the next access to that mutex will deadlock.
Fix this by moving the unlock to the end of the function, and adding a new label to allow jumping to the unlock portion of the function exit flow.
Fixes: fc2e6b3b132a ("iavf: Rework mutexes for better synchronisation") Signed-off-by: Jacob Keller jacob.e.keller@intel.com Tested-by: Rafal Romanowski rafal.romanowski@intel.com Signed-off-by: Tony Nguyen anthony.l.nguyen@intel.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/ethernet/intel/iavf/iavf_main.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/intel/iavf/iavf_main.c b/drivers/net/ethernet/intel/iavf/iavf_main.c index bcceb2ddfea63..1e349a90d21aa 100644 --- a/drivers/net/ethernet/intel/iavf/iavf_main.c +++ b/drivers/net/ethernet/intel/iavf/iavf_main.c @@ -2546,7 +2546,7 @@ static void iavf_adminq_task(struct work_struct *work) event.buf_len = IAVF_MAX_AQ_BUF_SIZE; event.msg_buf = kzalloc(event.buf_len, GFP_KERNEL); if (!event.msg_buf) - goto out; + goto unlock;
do { ret = iavf_clean_arq_element(hw, &event, &pending); @@ -2561,7 +2561,6 @@ static void iavf_adminq_task(struct work_struct *work) if (pending != 0) memset(event.msg_buf, 0, IAVF_MAX_AQ_BUF_SIZE); } while (pending); - mutex_unlock(&adapter->crit_lock);
if ((adapter->flags & IAVF_FLAG_SETUP_NETDEV_FEATURES)) { if (adapter->netdev_registered || @@ -2619,6 +2618,8 @@ static void iavf_adminq_task(struct work_struct *work)
freedom: kfree(event.msg_buf); +unlock: + mutex_unlock(&adapter->crit_lock); out: /* re-enable Admin queue interrupt cause */ iavf_misc_irq_enable(adapter);