• Serhey Popovych's avatar
    ipv6: Do not leak throw route references · 640a09c6
    Serhey Popovych authored
    
    [ Upstream commit 07f61557 ]
    
    While commit 73ba57bf ("ipv6: fix backtracking for throw routes")
    does good job on error propagation to the fib_rules_lookup()
    in fib rules core framework that also corrects throw routes
    handling, it does not solve route reference leakage problem
    happened when we return -EAGAIN to the fib_rules_lookup()
    and leave routing table entry referenced in arg->result.
    
    If rule with matched throw route isn't last matched in the
    list we overwrite arg->result losing reference on throw
    route stored previously forever.
    
    We also partially revert commit ab997ad4 ("ipv6: fix the
    incorrect return value of throw route") since we never return
    routing table entry with dst.error == -EAGAIN when
    CONFIG_IPV6_MULTIPLE_TABLES is on. Also there is no point
    to check for RTF_REJECT flag since it is always set throw
    route.
    
    Fixes: 73ba57bf ("ipv6: fix backtracking for throw routes")
    Signed-off-by: default avatarSerhey Popovych <serhe.popovych@gmail.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
    640a09c6
fib6_rules.c 7.49 KB