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authorJon Maloy <jon.maloy@ericsson.com>2018-01-17 16:42:46 +0100
committerDavid S. Miller <davem@davemloft.net>2018-01-19 15:12:21 -0500
commit60c2530696320ee6ffe4491c17079fa403790c98 (patch)
tree619bdaecd86e48c1962a6866e40ada7e09c5addc /net/tipc/group.h
parent30c3e9d470358a6741e00e1034a1ea85c6a516f0 (diff)
tipc: fix race between poll() and setsockopt()
Letting tipc_poll() dereference a socket's pointer to struct tipc_group entails a race risk, as the group item may be deleted in a concurrent tipc_sk_join() or tipc_sk_leave() thread. We now move the 'open' flag in struct tipc_group to struct tipc_sock, and let the former retain only a pointer to the moved field. This will eliminate the race risk. Reported-by: syzbot+799dafde0286795858ac@syzkaller.appspotmail.com Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/tipc/group.h')
-rw-r--r--net/tipc/group.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/net/tipc/group.h b/net/tipc/group.h
index f4a596ed9848..5996af6e9f1d 100644
--- a/net/tipc/group.h
+++ b/net/tipc/group.h
@@ -43,7 +43,8 @@ struct tipc_member;
struct tipc_msg;
struct tipc_group *tipc_group_create(struct net *net, u32 portid,
- struct tipc_group_req *mreq);
+ struct tipc_group_req *mreq,
+ bool *group_is_open);
void tipc_group_join(struct net *net, struct tipc_group *grp, int *sk_rcv_buf);
void tipc_group_delete(struct net *net, struct tipc_group *grp);
void tipc_group_add_member(struct tipc_group *grp, u32 node,
@@ -67,7 +68,6 @@ void tipc_group_update_bc_members(struct tipc_group *grp, int len, bool ack);
bool tipc_group_cong(struct tipc_group *grp, u32 dnode, u32 dport,
int len, struct tipc_member **m);
bool tipc_group_bc_cong(struct tipc_group *grp, int len);
-bool tipc_group_is_open(struct tipc_group *grp);
void tipc_group_update_rcv_win(struct tipc_group *grp, int blks, u32 node,
u32 port, struct sk_buff_head *xmitq);
u16 tipc_group_bc_snd_nxt(struct tipc_group *grp);