diff options
| author | Ralph Campbell <ralph.campbell@qlogic.com> | 2009-02-27 21:34:30 +0300 |
|---|---|---|
| committer | Roland Dreier <rolandd@cisco.com> | 2009-02-27 21:34:30 +0300 |
| commit | 1d9bc6d648ece77ffb41c5a577eab81fac5ad4de (patch) | |
| tree | f4694fe940cfd4cef0c1a96fd436984c1b2c6ea5 /drivers/infiniband/core | |
| parent | 7020cb0fe216fdcec246cdc2412614a3190fbb2f (diff) | |
| download | linux-1d9bc6d648ece77ffb41c5a577eab81fac5ad4de.tar.xz | |
IB/mad: Fix null pointer dereference in local_completions()
handle_outgoing_dr_smp() can queue a struct ib_mad_local_private
*local on the mad_agent_priv->local_work work queue with
local->mad_priv == NULL if device->process_mad() returns
IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY and
(!ib_response_mad(&mad_priv->mad.mad) ||
!mad_agent_priv->agent.recv_handler).
In this case, local_completions() will be called with local->mad_priv
== NULL. The code does check for this case and skips calling
recv_mad_agent->agent.recv_handler() but recv == 0 so
kmem_cache_free() is called with a NULL pointer.
Also, since recv isn't reinitialized each time through the loop, it
can cause a memory leak if recv should have been zero.
Signed-off-by: Ralph Campbell <ralph.campbell@qlogic.com>
Diffstat (limited to 'drivers/infiniband/core')
| -rw-r--r-- | drivers/infiniband/core/mad.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/infiniband/core/mad.c b/drivers/infiniband/core/mad.c index 5c54fc2350be..735ad4ea10f0 100644 --- a/drivers/infiniband/core/mad.c +++ b/drivers/infiniband/core/mad.c @@ -2356,7 +2356,7 @@ static void local_completions(struct work_struct *work) struct ib_mad_local_private *local; struct ib_mad_agent_private *recv_mad_agent; unsigned long flags; - int recv = 0; + int free_mad; struct ib_wc wc; struct ib_mad_send_wc mad_send_wc; @@ -2370,14 +2370,15 @@ static void local_completions(struct work_struct *work) completion_list); list_del(&local->completion_list); spin_unlock_irqrestore(&mad_agent_priv->lock, flags); + free_mad = 0; if (local->mad_priv) { recv_mad_agent = local->recv_mad_agent; if (!recv_mad_agent) { printk(KERN_ERR PFX "No receive MAD agent for local completion\n"); + free_mad = 1; goto local_send_completion; } - recv = 1; /* * Defined behavior is to complete response * before request @@ -2422,7 +2423,7 @@ local_send_completion: spin_lock_irqsave(&mad_agent_priv->lock, flags); atomic_dec(&mad_agent_priv->refcount); - if (!recv) + if (free_mad) kmem_cache_free(ib_mad_cache, local->mad_priv); kfree(local); } |