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lib: cpu_rmap: Fix potential use-after-free in irq_cpu_rmap_release()

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irq_cpu_rmap_release() calls cpu_rmap_put(), which may free the rmap.
So we need to clear the pointer to our glue structure in rmap before
doing that, not after.

Fixes: 4e0473f106 ("lib: cpu_rmap: Avoid use after free on rmap->obj array entries")
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Link: https://lore.kernel.org/r/ZHo0vwquhOy3FaXc@decadent.org.uk
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Ben Hutchings 2023-06-02 20:28:15 +02:00 committed by Jakub Kicinski
parent 44f8baaf23
commit 7c5d4801ec
1 changed files with 1 additions and 1 deletions
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2
lib/cpu_rmap.c
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@ -280,8 +280,8 @@ static void irq_cpu_rmap_release(struct kref *ref)
struct irq_glue *glue =
container_of(ref, struct irq_glue, notify.kref);
cpu_rmap_put(glue->rmap);
glue->rmap->obj[glue->index] = NULL;
cpu_rmap_put(glue->rmap);
kfree(glue);
}