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powerpc/eeh: Check handle_eeh_events() return value 

Function eeh_event_handler() dereferences the pointer returned by
handle_eeh_events() without checking, causing a crash if NULL was
returned, which is expected in some situations.

This patch fixes this bug by checking for the value returned by
handle_eeh_events() before dereferencing it.

Signed-off-by: Kleber Sacilotto de Souza <klebers@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
CC: stable@vger.kernel.org [v3.4+]
This commit is contained in:
Kleber Sacilotto de Souza 2012-07-12 17:14:36 +00:00 committed by Benjamin Herrenschmidt
parent 26b0d14106
commit 10db8d2128
1 changed files with 4 additions and 2 deletions
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6
arch/powerpc/platforms/pseries/eeh_event.c
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@ -85,8 +85,10 @@ static int eeh_event_handler(void * dummy)
set_current_state(TASK_INTERRUPTIBLE); /* Don't add to load average */
edev = handle_eeh_events(event);
eeh_clear_slot(eeh_dev_to_of_node(edev), EEH_MODE_RECOVERING);
pci_dev_put(edev->pdev);
if (edev) {
eeh_clear_slot(eeh_dev_to_of_node(edev), EEH_MODE_RECOVERING);
pci_dev_put(edev->pdev);
}
kfree(event);
mutex_unlock(&eeh_event_mutex);