net: fix a memleak when uncloning an skb dst and its metadata
[ Upstream commit 9eeabdf1 ] When uncloning an skb dst and its associated metadata, a new dst+metadata is allocated and later replaces the old one in the skb. This is helpful to have a non-shared dst+metadata attached to a specific skb. The issue is the uncloned dst+metadata is initialized with a refcount of 1, which is increased to 2 before attaching it to the skb. When tun_dst_unclone returns, the dst+metadata is only referenced from a single place (the skb) while its refcount is 2. Its refcount will never drop to 0 (when the skb is consumed), leading to a memory leak. Fix this by removing the call to dst_hold in tun_dst_unclone, as the dst+metadata refcount is already 1. Fixes: fc4099f1 ("openvswitch: Fix egress tunnel info.") Cc: Pravin B Shelar <pshelar@ovn.org> Reported-by:Vlad Buslov <vladbu@nvidia.com> Tested-by:
Vlad Buslov <vladbu@nvidia.com> Signed-off-by:
Antoine Tenart <atenart@kernel.org> Signed-off-by:
David S. Miller <davem@davemloft.net> Signed-off-by:
Sasha Levin <sashal@kernel.org>
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39a269fb
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