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netlink: fix netlink_diag_dump() return value

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__netlink_diag_dump() returns 1 if the dump is not complete,
zero if no error occurred.

If err variable is zero, this means the dump is complete:
We should not return skb->len in this case, but 0.

This allows NLMSG_DONE to be appended to the skb.
User space does not have to call us again only to get NLMSG_DONE.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Donald Hunter <donald.hunter@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2024-02-22 10:50:12 +00:00 • committed by David S. Miller
parent ac14ad9755
commit 6647b338fc
1 changed files with 1 additions and 1 deletions
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2
net/netlink/diag.c
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@ -207,7 +207,7 @@ static int netlink_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
err = __netlink_diag_dump(skb, cb, req->sdiag_protocol, s_num);
}
return err < 0 ? err : skb->len;
return err <= 0 ? err : skb->len;
}
static int netlink_diag_dump_done(struct netlink_callback *cb)