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tools: ynl: fix handling of multiple mcast groups

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[ Upstream commit b6c65eb20f ]

We never increment the group number iterator, so all groups
get recorded into index 0 of the mcast_groups[] array.

As a result YNL can only handle using the last group.
For example using the "netdev" sample on kernel with
page pool commands results in:

  $ ./samples/netdev
  YNL: Multicast group 'mgmt' not found

Most families have only one multicast group, so this hasn't
been noticed. Plus perhaps developers usually test the last
group which would have worked.

Fixes: 86878f14d7 ("tools: ynl: user space helpers")
Reviewed-by: Donald Hunter <donald.hunter@gmail.com>
Acked-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Link: https://lore.kernel.org/r/20240226214019.1255242-1-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jakub Kicinski 2024-02-26 13:40:18 -08:00 committed by Greg Kroah-Hartman
parent 80cd0487f6
commit dbc81b032d
1 changed files with 1 additions and 0 deletions
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tools/net/ynl/lib/ynl.c
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@ -507,6 +507,7 @@ ynl_get_family_info_mcast(struct ynl_sock *ys, const struct nlattr *mcasts)
ys->mcast_groups[i].name[GENL_NAMSIZ - 1] = 0;
}
}
i++;
}
return 0;