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Revert "fib_rules: return 0 directly if an exactly same rule exists when NLM_F_EXCL not supplied"

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[ Upstream commit 4970b42d5c ]

This reverts commit e9919a24d3.

Nathan reported the new behaviour breaks Android, as Android just add
new rules and delete old ones.

If we return 0 without adding dup rules, Android will remove the new
added rules and causing system to soft-reboot.

Fixes: e9919a24d3 ("fib_rules: return 0 directly if an exactly same rule exists when NLM_F_EXCL not supplied")
Reported-by: Nathan Chancellor <natechancellor@gmail.com>
Reported-by: Yaro Slav <yaro330@gmail.com>
Reported-by: Maciej Żenczykowski <zenczykowski@gmail.com>
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
Tested-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Hangbin Liu
2019-06-05 12:27:14 +08:00
committed by Greg Kroah-Hartman
parent 396244b6ec
commit d769853dbd
1 changed files with 3 additions and 3 deletions
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6
net/core/fib_rules.c
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@@ -756,9 +756,9 @@ int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr *nlh,
if (err)
goto errout;
if (rule_exists(ops, frh, tb, rule)) {
if (nlh->nlmsg_flags & NLM_F_EXCL)
err = -EEXIST;
if ((nlh->nlmsg_flags & NLM_F_EXCL) &&
rule_exists(ops, frh, tb, rule)) {
err = -EEXIST;
goto errout_free;
}