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net/netlink: fix NETLINK_LIST_MEMBERSHIPS length report

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[ Upstream commit f4e4534850 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Pedro Tammela 2023-05-29 12:33:35 -03:00 • committed by Greg Kroah-Hartman
commit 57e6c54034
1 changed files with 1 additions and 1 deletions
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2
net/netlink/af_netlink.c
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@ -1781,7 +1781,7 @@ 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;