Commit 737889ef authored Mar 22, 2019 by Jon Maloy Committed by David S. Miller Mar 23, 2019

tipc: tipc clang warning



When checking the code with clang -Wsometimes-uninitialized we get the
following warning:

if (!tipc_link_is_establishing(l)) {
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
net/tipc/node.c:847:46: note: uninitialized use occurs here
      tipc_bearer_xmit(n->net, bearer_id, &xmitq, maddr);

net/tipc/node.c:831:2: note: remove the 'if' if its condition is always
true
if (!tipc_link_is_establishing(l)) {
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
net/tipc/node.c:821:31: note: initialize the variable 'maddr' to silence
this warning
struct tipc_media_addr *maddr;

We fix this by initializing 'maddr' to NULL. For the matter of clarity,
we also test if 'xmitq' is non-empty before we use it and 'maddr'
further down in the  function. It will never happen that 'xmitq' is non-
empty at the same time as 'maddr' is NULL, so this is a sufficient test.

Fixes: 598411d7 ("tipc: make resetting of links non-atomic")
Reported-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 064c5d68

net/tipc/node.c

+4 −3

Original line number	Diff line number	Diff line
		@@ -817,10 +817,10 @@ static void __tipc_node_link_down(struct tipc_node n, int bearer_id,
		static void tipc_node_link_down(struct tipc_node *n, int bearer_id, bool delete)
		{
		struct tipc_link_entry *le = &n->links[bearer_id];
		struct tipc_media_addr *maddr = NULL;
		struct tipc_link *l = le->link;
		struct tipc_media_addr *maddr;
		struct sk_buff_head xmitq;
		int old_bearer_id = bearer_id;
		struct sk_buff_head xmitq;

		if (!l)
		return;
		@@ -844,6 +844,7 @@ static void tipc_node_link_down(struct tipc_node *n, int bearer_id, bool delete)
		tipc_node_write_unlock(n);
		if (delete)
		tipc_mon_remove_peer(n->net, n->addr, old_bearer_id);
		if (!skb_queue_empty(&xmitq))
		tipc_bearer_xmit(n->net, bearer_id, &xmitq, maddr);
		tipc_sk_rcv(n->net, &le->inputq);
		}