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RDMA/cma: Fix hardware address comparison length in netevent callback

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[ Upstream commit 18313833e2 ]

The cited commit hardcoded the hardware address comparison len to ETH_ALEN.

This breaks IPoIB, which uses 20-byte addresses. By truncating the
memcmp, the CMA may incorrectly assume the target address is
unchanged and fails to abort the stalled connection.

Fix this by replacing ETH_ALEN with the dynamic neigh->dev->addr_len
to correctly evaluate the full address regardless of the link layer.

Fixes: 925d046e7e ("RDMA/core: Add a netevent notifier to cma")
Signed-off-by: Or Gerlitz <ogerlitz@ddn.com>
Link: https://patch.msgid.link/20260617-fix-cma-ipoib-v1-1-03f869344304@ddn.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Or Gerlitz
2026-08-03 11:15:12 +02:00
committed by Greg Kroah-Hartman
parent 86f5ea90f7
commit e33760e076
1 changed files with 1 additions and 1 deletions
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drivers/infiniband/core/cma.c
+1 -1
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@@ -5215,7 +5215,7 @@ static int cma_netevent_callback(struct notifier_block *self,
list_for_each_entry(current_id, &ips_node->id_list, id_list_entry) {
if (!memcmp(current_id->id.route.addr.dev_addr.dst_dev_addr,
neigh->ha, ETH_ALEN))
neigh->ha, neigh->dev->addr_len))
continue;
cma_id_get(current_id);
if (!queue_work(cma_wq, &current_id->id.net_work))