From: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
[ Upstream commit 7c5d4801ecf0564c860033d89726b99723c55146 ]
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: 4e0473f1060a ("lib: cpu_rmap: Avoid use after free on rmap->obj array entries")
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
Reviewed-by: Simon Horman <simon.horman@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/ZHo0vwquhOy3FaXc@xxxxxxxxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
lib/cpu_rmap.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/lib/cpu_rmap.c b/lib/cpu_rmap.c
index e77f12bb3c774..1833ad73de6fc 100644
--- a/lib/cpu_rmap.c
+++ b/lib/cpu_rmap.c
@@ -268,8 +268,8 @@ 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);
}
--
2.39.2
