lib: cpu_rmap: Avoid use after free on rmap->obj array entries

[ Upstream commit 4e0473f1060aa49621d40a113afde24818101d37 ]

When calling irq_set_affinity_notifier() with NULL at the notify
argument, it will cause freeing of the glue pointer in the
corresponding array entry but will leave the pointer in the array. A
subsequent call to free_irq_cpu_rmap() will try to free this entry again
leading to possible use after free.

Fix that by setting NULL to the array entry and checking that we have
non-zero at the array entry when iterating over the array in
free_irq_cpu_rmap().

The current code does not suffer from this since there are no cases
where irq_set_affinity_notifier(irq, NULL) (note the NULL passed for the
notify arg) is called, followed by a call to free_irq_cpu_rmap() so we
don't hit and issue. Subsequent patches in this series excersize this
flow, hence the required fix.

Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Eli Cohen <elic@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/lib/cpu_rmap.c b/lib/cpu_rmap.c
index f610b2a10b3eda40c8e04f30f3779556502e9fe6..f52389054a24fb4ca111e9e9567c1e0875441fbd 100644 (file)
--- a/lib/cpu_rmap.c
+++ b/lib/cpu_rmap.c
@@ -235,7 +235,8 @@ void free_irq_cpu_rmap(struct cpu_rmap *rmap)
 
        for (index = 0; index < rmap->used; index++) {
                glue = rmap->obj[index];
-               irq_set_affinity_notifier(glue->notify.irq, NULL);
+               if (glue)
+                       irq_set_affinity_notifier(glue->notify.irq, NULL);
        }
 
        cpu_rmap_put(rmap);
@@ -271,6 +272,7 @@ static void irq_cpu_rmap_release(struct kref *ref)
                container_of(ref, struct irq_glue, notify.kref);
 
        cpu_rmap_put(glue->rmap);
+       glue->rmap->obj[glue->index] = NULL;
        kfree(glue);
 }
 
@@ -300,6 +302,7 @@ int irq_cpu_rmap_add(struct cpu_rmap *rmap, int irq)
        rc = irq_set_affinity_notifier(irq, &glue->notify);
        if (rc) {
                cpu_rmap_put(glue->rmap);
+               rmap->obj[glue->index] = NULL;
                kfree(glue);
        }
        return rc;