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batman-adv: bla: prevent use-after-free when deleting claims

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When batadv_bla_del_backbone_claims() removes all claims for a backbone, it
does this by dropping the link entry in the hash list. This list entry
itself was one of the references which need to be dropped at the same time
via batadv_claim_put().

But the batadv_claim_put() must not be done before the last access to the
claim object in this function. Otherwise the claim might be freed already
by the batadv_claim_release() function before the list entry was dropped.

Cc: stable@kernel.org
Fixes: 23721387c4 ("batman-adv: add basic bridge loop avoidance code")
Signed-off-by: Sven Eckelmann <sven@narfation.org>
This commit is contained in:
Sven Eckelmann 2026-05-06 22:20:50 +02:00
parent ce425dd05d
commit 4ae1709a31
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GPG Key ID: 4D0F772BD314F5CB
1 changed files with 1 additions and 1 deletions
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2
net/batman-adv/bridge_loop_avoidance.c
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@ -318,8 +318,8 @@ batadv_bla_del_backbone_claims(struct batadv_bla_backbone_gw *backbone_gw)
if (claim->backbone_gw != backbone_gw)
continue;
batadv_claim_put(claim);
hlist_del_rcu(&claim->hash_entry);
batadv_claim_put(claim);
}
spin_unlock_bh(list_lock);
}