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net: decnet: fix netdev refcount leaking on error path 

On building the route there is an assumption that the destination
could be local. In this case loopback_dev is used to get the address.
If the address is still cannot be retrieved dn_route_output_slow
returns EADDRNOTAVAIL with loopback_dev reference taken.

Cannot find hash for the fixes tag because this code was introduced
long time ago. I don't think that this bug has ever fired but the
patch is done just to have a consistent code base.

Signed-off-by: Vadim Fedorenko <vfedorenko@novek.ru>
Link: https://lore.kernel.org/r/1611619334-20955-1-git-send-email-vfedorenko@novek.ru
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Vadim Fedorenko 2021-01-26 03:02:14 +03:00 committed by Jakub Kicinski
parent 20776b465c
commit 3f96d64497
1 changed files with 1 additions and 1 deletions
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2
net/decnet/dn_route.c
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@ -1035,7 +1035,7 @@ static int dn_route_output_slow(struct dst_entry **pprt, const struct flowidn *o
fld.saddr = dnet_select_source(dev_out, 0,
RT_SCOPE_HOST);
if (!fld.daddr)
goto out;
goto done;
}
fld.flowidn_oif = LOOPBACK_IFINDEX;
res.type = RTN_LOCAL;