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net: make sure we never create ifindex = 0 

Instead of allocating from 1 use proper xa_init flag,
to protect ourselves from IDs wrapping back to 0.

Fixes: 759ab1edb5 ("net: store netdevs in an xarray")
Reported-by: Stephen Hemminger <stephen@networkplumber.org>
Link: https://lore.kernel.org/all/20230728162350.2a6d4979@hermes.local/
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Link: https://lore.kernel.org/r/20230731171159.988962-1-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jakub Kicinski 2023-07-31 10:11:58 -07:00
parent 005c960000
commit ceaac91dcd
1 changed files with 1 additions and 2 deletions
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3
net/core/dev.c
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@ -11271,8 +11271,7 @@ static int __net_init netdev_init(struct net *net)
if (net->dev_index_head == NULL)
goto err_idx;
net->ifindex = 1;
xa_init_flags(&net->dev_by_index, XA_FLAGS_ALLOC);
xa_init_flags(&net->dev_by_index, XA_FLAGS_ALLOC1);
RAW_INIT_NOTIFIER_HEAD(&net->netdev_chain);