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 <shaobo@xxxxxxxxxxx> --- 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
