[PATCH v2] sunrpc: fix uninitialized xprt_create_args structure

The xprt_create_args structure is allocated on the stack without
initialization in rpc_sysfs_xprt_switch_add_xprt_store(). While some
fields are manually populated, critical fields like srcaddr, bc_xps,
and flags contain uninitialized stack garbage.

This can lead to:
1. Kernel panic when xs_setup_xprt() dereferences garbage srcaddr
2. Information leak if srcaddr points to sensitive stack data
3. Unpredictable behavior if flags has random bits set

The fix is to zero-initialize the structure to ensure all unused
fields are NULL/0, preventing the transport setup code from acting
on garbage data.

Cc: stable@vger.kernel.org
Suggested-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Hongling Zeng <redacted>

---
Changes in V2:
- Use designated initializer instead of memset, as suggested by
  Jeff Layton
- Add Reviewed-by tag

---
 net/sunrpc/sysfs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/sunrpc/sysfs.c b/net/sunrpc/sysfs.c
index a90480f80154..4669227a6de6 100644
--- a/net/sunrpc/sysfs.c
+++ b/net/sunrpc/sysfs.c

@@ -327,7 +327,7 @@ static ssize_t rpc_sysfs_xprt_switch_add_xprt_store(struct kobject *kobj,
 {
 	struct rpc_xprt_switch *xprt_switch =
 		rpc_sysfs_xprt_switch_kobj_get_xprt(kobj);
-	struct xprt_create xprt_create_args;
+	struct xprt_create xprt_create_args = {};
 	struct rpc_xprt *xprt, *new;
 
 	if (!xprt_switch)

-- 
2.25.1