bonding: Pass string literal as format argument of alloc_ordered_workqueue()

Recently I noticed that both gcc-14 and clang-18 report that passing
a non-string literal as the format argument of alloc_ordered_workqueue
is potentially insecure.

F.e. clang-18 says:

.../bond_main.c:6384:37: warning: format string is not a string literal (potentially insecure) [-Wformat-security]
 6384 |         bond->wq = alloc_ordered_workqueue(bond_dev->name, WQ_MEM_RECLAIM);
      |                                            ^~~~~~~~~~~~~~
.../workqueue.h:524:18: note: expanded from macro 'alloc_ordered_workqueue'
  524 |         alloc_workqueue(fmt, WQ_UNBOUND | __WQ_ORDERED | (flags), 1, ##args)
      |                         ^~~
.../bond_main.c:6384:37: note: treat the string as an argument to avoid this
 6384 |         bond->wq = alloc_ordered_workqueue(bond_dev->name, WQ_MEM_RECLAIM);
      |                                            ^
      |                                            "%s",
..../workqueue.h:524:18: note: expanded from macro 'alloc_ordered_workqueue'
  524 |         alloc_workqueue(fmt, WQ_UNBOUND | __WQ_ORDERED | (flags), 1, ##args)
      |                         ^

Perhaps it is always the case where the contents of bond_dev->name is
safe to pass as the format argument. That is, in my understanding, it
never contains any format escape sequences.

But, it seems better to be safe than sorry. And, as a bonus, compiler
output becomes less verbose by addressing this issue as suggested by
clang-18.

Signed-off-by: Simon Horman <horms@kernel.org>
Acked-by: Jay Vosburgh <jv@jvosburgh.net>
Link: https://patch.msgid.link/20240806-bonding-fmt-v1-1-e75027e45775@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 1cd92c1..f9633a6 100644 (file)
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -6338,7 +6338,8 @@ static int bond_init(struct net_device *bond_dev)
 
        netdev_dbg(bond_dev, "Begin bond_init\n");
 
-       bond->wq = alloc_ordered_workqueue(bond_dev->name, WQ_MEM_RECLAIM);
+       bond->wq = alloc_ordered_workqueue("%s", WQ_MEM_RECLAIM,
+                                          bond_dev->name);
        if (!bond->wq)
                return -ENOMEM;