linux-kernel - infiniband/hw/nes/nes

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Date:	Wed, 20 Feb 2008 02:58:48 +0200
From:	Adrian Bunk <bunk@...nel.org>
To:	flatif@...effect.com, gstreiff@...effect.com
Cc:	general@...ts.openfabrics.org, linux-kernel@...r.kernel.org
Subject: infiniband/hw/nes/nes_cm.c: use-after-free

Spotted by the Coverity checker.

<--  snip  -->

...
static int mini_cm_dec_refcnt_listen(struct nes_cm_core *cm_core,
                struct nes_cm_listener *listener, int free_hanging_nodes)
{
        int ret = 1;
        unsigned long flags;
        spin_lock_irqsave(&cm_core->listen_list_lock, flags);
        if (!atomic_dec_return(&listener->ref_count)) {
                list_del(&listener->list);

                /* decrement our listen node count */
                atomic_dec(&cm_core->listen_node_cnt);

                spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);

                if (listener->nesvnic) {
                        nes_manage_apbvt(listener->nesvnic, listener->loc_port,
                                        PCI_FUNC(listener->nesvnic->nesdev->pcidev->devfn), NES_MANAGE_APBVT_DEL);
                }

                nes_debug(NES_DBG_CM, "destroying listener (%p)\n", listener);

                kfree(listener);     <----------------------------------
                ret = 0;
                cm_listens_destroyed++;
        } else {
                spin_unlock_irqrestore(&cm_core->listen_list_lock, flags);
        }
        if (listener) {
                if (atomic_read(&listener->pend_accepts_cnt) > 0)
...                              ^^^^^^^^^^^^^^^^^^^^^^^^^^

<--  snip  -->

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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