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fib_rules: fix error in backport of e9919a24d3 ("fib_rules: return 0...")

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When commit e9919a24d3 ("fib_rules: return 0 directly if an exactly
same rule exists when NLM_F_EXCL not supplied") was backported to 4.9.y,
it changed the logic a bit as err should have been reset before exiting
the test, like it happens in the original logic.

If this is not set, errors happen :(

Reported-by: Nathan Chancellor <natechancellor@gmail.com>
Reported-by: David Ahern <dsahern@gmail.com>
Reported-by: Florian Westphal <fw@strlen.de>
Cc: Hangbin Liu <liuhangbin@gmail.com>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Greg Kroah-Hartman 2019-05-20 11:07:29 +02:00
parent 654a509d8e
commit 691306ebd1
1 changed files with 1 additions and 0 deletions
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net/core/fib_rules.c
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@ -564,6 +564,7 @@ int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr *nlh,
}
if (rule_exists(ops, frh, tb, rule)) {
err = 0;
if (nlh->nlmsg_flags & NLM_F_EXCL)
err = -EEXIST;
goto errout_free;