[PATCH] cxgb4: fix undefined behavior in mem.c

[Shaobo He]

In function `c4iw_dealloc_mw`, variable mhp's value is printed after
freed, which triggers undefined behavior according to this post:
https://trust-in-soft.com/dangling-pointer-indeterminate/.

This commit fixes it by swapping the order of `kfree` and `pr_debug`.

Signed-off-by: Shaobo He <sha...@cs.utah.edu>
---
 drivers/infiniband/hw/cxgb4/mem.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/infiniband/hw/cxgb4/mem.c 
b/drivers/infiniband/hw/cxgb4/mem.c
index 7b76e6f..bb8e0bc 100644
--- a/drivers/infiniband/hw/cxgb4/mem.c
+++ b/drivers/infiniband/hw/cxgb4/mem.c
@@ -684,8 +684,8 @@ int c4iw_dealloc_mw(struct ib_mw *mw)
                          mhp->wr_waitp);
        kfree_skb(mhp->dereg_skb);
        c4iw_put_wr_wait(mhp->wr_waitp);
-       kfree(mhp);
        pr_debug("ib_mw %p mmid 0x%x ptr %p\n", mw, mmid, mhp);
+       kfree(mhp);
        return 0;
 }
 
-- 
2.7.4