IB/hfi1: Fix memory leak in exception path in get_irq_affinity()

When IRQ affinity is set and the interrupt type is unknown, a cpu
mask allocated within the function is never freed. Fix this memory
leak by allocating memory within the scope where it is used.

Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Reviewed-by: Michael J. Ruhl <michael.j.ruhl@intel.com>
Signed-off-by: Sebastian Sanchez <sebastian.sanchez@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

diff --git a/drivers/infiniband/hw/hfi1/affinity.c b/drivers/infiniband/hw/hfi1/affinity.c
index a97055d..b5fab55 100644 (file)
--- a/drivers/infiniband/hw/hfi1/affinity.c
+++ b/drivers/infiniband/hw/hfi1/affinity.c
@@ -412,7 +412,6 @@ static void hfi1_cleanup_sdma_notifier(struct hfi1_msix_entry *msix)
 static int get_irq_affinity(struct hfi1_devdata *dd,
                            struct hfi1_msix_entry *msix)
 {
-       int ret;
        cpumask_var_t diff;
        struct hfi1_affinity_node *entry;
        struct cpu_mask_set *set = NULL;
@@ -424,10 +423,6 @@ static int get_irq_affinity(struct hfi1_devdata *dd,
        extra[0] = '\0';
        cpumask_clear(&msix->mask);
 
-       ret = zalloc_cpumask_var(&diff, GFP_KERNEL);
-       if (!ret)
-               return -ENOMEM;
-
        entry = node_affinity_lookup(dd->node);
 
        switch (msix->type) {
@@ -458,6 +453,9 @@ static int get_irq_affinity(struct hfi1_devdata *dd,
         * finds its CPU here.
         */
        if (cpu == -1 && set) {
+               if (!zalloc_cpumask_var(&diff, GFP_KERNEL))
+                       return -ENOMEM;
+
                if (cpumask_equal(&set->mask, &set->used)) {
                        /*
                         * We've used up all the CPUs, bump up the generation
@@ -469,6 +467,8 @@ static int get_irq_affinity(struct hfi1_devdata *dd,
                cpumask_andnot(diff, &set->mask, &set->used);
                cpu = cpumask_first(diff);
                cpumask_set_cpu(cpu, &set->used);
+
+               free_cpumask_var(diff);
        }
 
        cpumask_set_cpu(cpu, &msix->mask);
@@ -482,7 +482,6 @@ static int get_irq_affinity(struct hfi1_devdata *dd,
                hfi1_setup_sdma_notifier(msix);
        }
 
-       free_cpumask_var(diff);
        return 0;
 }