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igmp: fix ip_mc_sf_allow race [v5]

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Almost all igmp functions accessing inet->mc_list are protected by
rtnl_lock(), but there is one exception which is ip_mc_sf_allow(),
so there is a chance of either ip_mc_drop_socket or ip_mc_leave_group
remove an entry while ip_mc_sf_allow is running causing a crash.

Signed-off-by: Flavio Leitner <fleitner@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Flavio Leitner 2010-02-02 07:32:29 -08:00 • committed by David S. Miller
parent 8b64056dac
commit c85bb41e93
2 changed files with 64 additions and 21 deletions
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2
include/linux/igmp.h
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@ -153,6 +153,7 @@ extern int sysctl_igmp_max_msf;
struct ip_sf_socklist {
unsigned int sl_max;
unsigned int sl_count;
struct rcu_head rcu;
__be32 sl_addr[0];
};
@ -170,6 +171,7 @@ struct ip_mc_socklist {
struct ip_mreqn multi;
unsigned int sfmode; /* MCAST_{INCLUDE,EXCLUDE} */
struct ip_sf_socklist *sflist;
struct rcu_head rcu;
};
struct ip_sf_list {