From: Jon Maloy jon.maloy@ericsson.com
[ Upstream commit 737889efe9713a0f20a75fd0de952841d9275e6b ]
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: 598411d70f85 ("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 Signed-off-by: Sasha Levin sashal@kernel.org --- net/tipc/node.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/net/tipc/node.c b/net/tipc/node.c index 32556f480a606..e67ffd1949272 100644 --- a/net/tipc/node.c +++ b/net/tipc/node.c @@ -810,10 +810,10 @@ 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; @@ -835,7 +835,8 @@ 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); - tipc_bearer_xmit(n->net, bearer_id, &xmitq, maddr); + if (!skb_queue_empty(&xmitq)) + tipc_bearer_xmit(n->net, bearer_id, &xmitq, maddr); tipc_sk_rcv(n->net, &le->inputq); }