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RDMA/cma: Use output interface for net_dev check

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[ Upstream commit eb83f502ad ]

Commit 27cfde795a ("RDMA/cma: Fix arguments order in net device
validation") swapped the src and dst addresses in the call to
validate_net_dev().

As a consequence, the test in validate_ipv4_net_dev() to see if the
net_dev is the right one, is incorrect for port 1 <-> 2 communication when
the ports are on the same sub-net. This is fixed by denoting the
flowi4_oif as the device instead of the incoming one.

The bug has not been observed using IPv6 addresses.

Fixes: 27cfde795a ("RDMA/cma: Fix arguments order in net device validation")
Signed-off-by: Håkon Bugge <haakon.bugge@oracle.com>
Link: https://lore.kernel.org/r/20221012141542.16925-1-haakon.bugge@oracle.com
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Håkon Bugge 2022-10-12 16:15:42 +02:00 • committed by Greg Kroah-Hartman
commit 87ac93c8dd
1 changed files with 1 additions and 1 deletions
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2
drivers/infiniband/core/cma.c
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@ -1437,7 +1437,7 @@ static bool validate_ipv4_net_dev(struct net_device *net_dev,
return false;
memset(&fl4, 0, sizeof(fl4));
fl4.flowi4_iif = net_dev->ifindex;
fl4.flowi4_oif = net_dev->ifindex;
fl4.daddr = daddr;
fl4.saddr = saddr;