commit 56b2eca3fea8ea4fb6ec732b98470a09385cb1eb
author Hariprasad S <hariprasad@chelsio.com> Thu Jun 30 11:44:33 2016 +0530
committer Doug Ledford <dledford@redhat.com> Tue Aug 02 13:04:42 2016 -0400
tree 992b5feaca30f70ec9efef8f0830955f4a0677dc
parent dd6b0241260d0f16c4051da1c5b09d4da8992ef2

RDMA/iw_cxgb4: Use kfree_skb instead of kfree

The commit 0f8ab0b6e91b4d53 ("RDMA/iw_cxgb4: Low resource fixes for Memory
registration") from Jun 10, 2016, leads to the following static checker
warning:

        drivers/infiniband/hw/cxgb4/mem.c:612 c4iw_alloc_mw()
        error: use kfree_skb() here instead of kfree(mhp->dereg_skb)

Also fixes skb leak in c4iw_dealloc_mw

Fixes: 0f8ab0b6e91b4d53 ("RDMA/iw_cxgb4: Low resource fixes for Memory registration")

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Hariprasad Shenai <hariprasad@chelsio.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/hw/cxgb4/mem.c

diff --git a/drivers/infiniband/hw/cxgb4/mem.c b/drivers/infiniband/hw/cxgb4/mem.c
index 5d0aa55..0b91b0f 100644
--- a/drivers/infiniband/hw/cxgb4/mem.c
+++ b/drivers/infiniband/hw/cxgb4/mem.c
@@ -603,16 +603,13 @@
 
 	mhp->dereg_skb = alloc_skb(SGE_MAX_WR_LEN, GFP_KERNEL);
 	if (!mhp->dereg_skb) {
-		kfree(mhp);
-		return ERR_PTR(-ENOMEM);
+		ret = -ENOMEM;
+		goto free_mhp;
 	}
 
 	ret = allocate_window(&rhp->rdev, &stag, php->pdid);
-	if (ret) {
-		kfree(mhp->dereg_skb);
-		kfree(mhp);
-		return ERR_PTR(ret);
-	}
+	if (ret)
+		goto free_skb;
 	mhp->rhp = rhp;
 	mhp->attr.pdid = php->pdid;
 	mhp->attr.type = FW_RI_STAG_MW;
@@ -620,13 +617,19 @@
 	mmid = (stag) >> 8;
 	mhp->ibmw.rkey = stag;
 	if (insert_handle(rhp, &rhp->mmidr, mhp, mmid)) {
-		deallocate_window(&rhp->rdev, mhp->attr.stag, mhp->dereg_skb);
-		kfree(mhp->dereg_skb);
-		kfree(mhp);
-		return ERR_PTR(-ENOMEM);
+		ret = -ENOMEM;
+		goto dealloc_win;
 	}
 	PDBG("%s mmid 0x%x mhp %p stag 0x%x\n", __func__, mmid, mhp, stag);
 	return &(mhp->ibmw);
+
+dealloc_win:
+	deallocate_window(&rhp->rdev, mhp->attr.stag, mhp->dereg_skb);
+free_skb:
+	kfree_skb(mhp->dereg_skb);
+free_mhp:
+	kfree(mhp);
+	return ERR_PTR(ret);
 }
 
 int c4iw_dealloc_mw(struct ib_mw *mw)
@@ -640,6 +643,7 @@
 	mmid = (mw->rkey) >> 8;
 	remove_handle(rhp, &rhp->mmidr, mmid);
 	deallocate_window(&rhp->rdev, mhp->attr.stag, mhp->dereg_skb);
+	kfree_skb(mhp->dereg_skb);
 	kfree(mhp);
 	PDBG("%s ib_mw %p mmid 0x%x ptr %p\n", __func__, mw, mmid, mhp);
 	return 0;