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net/netlink: fix NETLINK_LIST_MEMBERSHIPS length report 

The current code for the length calculation wrongly truncates the reported
length of the groups array, causing an under report of the subscribed
groups. To fix this, use 'BITS_TO_BYTES()' which rounds up the
division by 8.

Fixes: b42be38b27 ("netlink: add API to retrieve all group memberships")
Signed-off-by: Pedro Tammela <pctammela@mojatatu.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Link: https://lore.kernel.org/r/20230529153335.389815-1-pctammela@mojatatu.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Pedro Tammela 2023-05-29 12:33:35 -03:00 committed by Jakub Kicinski
parent 36eec020fa
commit f4e4534850
1 changed files with 1 additions and 1 deletions
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2
net/netlink/af_netlink.c
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@ -1779,7 +1779,7 @@ static int netlink_getsockopt(struct socket *sock, int level, int optname,
break;
}
}
if (put_user(ALIGN(nlk->ngroups / 8, sizeof(u32)), optlen))
if (put_user(ALIGN(BITS_TO_BYTES(nlk->ngroups), sizeof(u32)), optlen))
err = -EFAULT;
netlink_unlock_table();
return err;