Commit bb3a420d authored by Peilin Ye's avatar Peilin Ye Committed by David S. Miller

tipc: Fix memory leak in tipc_group_create_member()

tipc_group_add_to_tree() returns silently if `key` matches `nkey` of an
existing node, causing tipc_group_create_member() to leak memory. Let
tipc_group_add_to_tree() return an error in such a case, so that
tipc_group_create_member() can handle it properly.

Fixes: 75da2163 ("tipc: introduce communication groups")
Reported-and-tested-by: syzbot+f95d90c454864b3b5bc9@syzkaller.appspotmail.com
Cc: Hillf Danton <hdanton@sina.com>
Link: https://syzkaller.appspot.com/bug?id=048390604fe1b60df34150265479202f10e13affSigned-off-by: default avatarPeilin Ye <yepeilin.cs@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 1869e226
......@@ -273,7 +273,7 @@ static struct tipc_member *tipc_group_find_node(struct tipc_group *grp,
return NULL;
}
static void tipc_group_add_to_tree(struct tipc_group *grp,
static int tipc_group_add_to_tree(struct tipc_group *grp,
struct tipc_member *m)
{
u64 nkey, key = (u64)m->node << 32 | m->port;
......@@ -291,10 +291,11 @@ static void tipc_group_add_to_tree(struct tipc_group *grp,
else if (key > nkey)
n = &(*n)->rb_right;
else
return;
return -EEXIST;
}
rb_link_node(&m->tree_node, parent, n);
rb_insert_color(&m->tree_node, &grp->members);
return 0;
}
static struct tipc_member *tipc_group_create_member(struct tipc_group *grp,
......@@ -302,6 +303,7 @@ static struct tipc_member *tipc_group_create_member(struct tipc_group *grp,
u32 instance, int state)
{
struct tipc_member *m;
int ret;
m = kzalloc(sizeof(*m), GFP_ATOMIC);
if (!m)
......@@ -314,8 +316,12 @@ static struct tipc_member *tipc_group_create_member(struct tipc_group *grp,
m->port = port;
m->instance = instance;
m->bc_acked = grp->bc_snd_nxt - 1;
ret = tipc_group_add_to_tree(grp, m);
if (ret < 0) {
kfree(m);
return NULL;
}
grp->member_cnt++;
tipc_group_add_to_tree(grp, m);
tipc_nlist_add(&grp->dests, m->node);
m->state = state;
return m;
......
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