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tipc: eliminate case of writing to freed memory

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In the function tipc_nodesub_notify() we call a function pointer
aggregated into the object to be notified, whereafter we set
the function pointer to NULL. However, in some cases the function
pointed to will free the struct containing the function pointer,
resulting in a write to already freed memory.

This bug seems to always have been there, without causing any
notable harm.

In this commit we fix the problem by inverting the order of the
zeroing and the function call.

Signed-off-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jon Paul Maloy 2014-06-25 20:41:30 -05:00 committed by David S. Miller
parent f5b265039f
commit 3d09fc4244
1 changed files with 4 additions and 2 deletions
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6
net/tipc/node_subscr.c
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@ -84,11 +84,13 @@ void tipc_nodesub_unsubscribe(struct tipc_node_subscr *node_sub)
void tipc_nodesub_notify(struct list_head *nsub_list)
{
struct tipc_node_subscr *ns, *safe;
net_ev_handler handle_node_down;
list_for_each_entry_safe(ns, safe, nsub_list, nodesub_list) {
if (ns->handle_node_down) {
ns->handle_node_down(ns->usr_handle);
handle_node_down = ns->handle_node_down;
if (handle_node_down) {
ns->handle_node_down = NULL;
handle_node_down(ns->usr_handle);
}
}
}