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Subject[PATCH] route: put lwstate before freeing dst to avoid use after free
Date
Commit 61adedf3 ("route: move lwtunnel state to dst_entry") is trying to
release lwstate after getting rid of dst, which causes a use-after-free
trying to access dst->lwstate.

Fixes: 61adedf3 ("route: move lwtunnel state to dst_entry")
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
---
net/core/dst.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/core/dst.c b/net/core/dst.c
index 50dcdbb..477035e 100644
--- a/net/core/dst.c
+++ b/net/core/dst.c
@@ -262,11 +262,12 @@ again:
if (dst->dev)
dev_put(dst->dev);

+ lwtstate_put(dst->lwtstate);
+
if (dst->flags & DST_METADATA)
kfree(dst);
else
kmem_cache_free(dst->ops->kmem_cachep, dst);
- lwtstate_put(dst->lwtstate);

dst = child;
if (dst) {
--
1.7.10.4


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