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ipv6: invert flowlabel sharing check in process and user mode

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[ Upstream commit 95c169251b ]

A request for a flowlabel fails in process or user exclusive mode must
fail if the caller pid or uid does not match. Invert the test.

Previously, the test was unsafe wrt PID recycling, but indeed tested
for inequality: fl1->owner != fl->owner

Fixes: 4f82f45730 ("net ip6 flowlabel: Make owner a union of struct pid* and kuid_t")
Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Willem de Bruijn
2019-04-25 12:06:54 -04:00
committed by Greg Kroah-Hartman
parent 39eddbb7ca
commit f78ec0cd06
1 changed files with 2 additions and 2 deletions
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4
net/ipv6/ip6_flowlabel.c
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@@ -639,9 +639,9 @@ recheck:
if (fl1->share == IPV6_FL_S_EXCL ||
fl1->share != fl->share ||
((fl1->share == IPV6_FL_S_PROCESS) &&
(fl1->owner.pid == fl->owner.pid)) ||
(fl1->owner.pid != fl->owner.pid)) ||
((fl1->share == IPV6_FL_S_USER) &&
uid_eq(fl1->owner.uid, fl->owner.uid)))
!uid_eq(fl1->owner.uid, fl->owner.uid)))
goto release;
err = -ENOMEM;