[PATCHv2 iw_cxgb4-4.8] RDMA/iw_cxgb4: Use kfree_skb instead of kfree

[PATCHv2 iw_cxgb4-4.8] RDMA/iw_cxgb4: Use kfree_skb instead of kfree

[Hariprasad Shenai]

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-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
Signed-off-by: Steve Wise <swise-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org>
Signed-off-by: Hariprasad Shenai <hariprasad-ut6Up61K2wZBDgjK7y7TUQ@public.gmane.org>
---

V2: kfree_skb() checks if skb is freed, so no need to check again.
    Based on review comments by Leon Romanovsky <leon-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>

 drivers/infiniband/hw/cxgb4/mem.c | 26 +++++++++++++++-----------
 1 file changed, 15 insertions(+), 11 deletions(-)

diff --git a/drivers/infiniband/hw/cxgb4/mem.c b/drivers/infiniband/hw/cxgb4/mem.c
index 5d0aa55e82d4..0b91b0f4df71 100644
--- a/drivers/infiniband/hw/cxgb4/mem.c
+++ b/drivers/infiniband/hw/cxgb4/mem.c
@@ -603,16 +603,13 @@ struct ib_mw *c4iw_alloc_mw(struct ib_pd *pd, enum ib_mw_type type,
 
 	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 @@ struct ib_mw *c4iw_alloc_mw(struct ib_pd *pd, enum ib_mw_type type,
 	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 @@ int c4iw_dealloc_mw(struct ib_mw *mw)
 	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;
-- 
2.3.4

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Re: [PATCHv2 iw_cxgb4-4.8] RDMA/iw_cxgb4: Use kfree_skb instead of kfree

[Doug Ledford]

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On Thu, 2016-06-30 at 11:44 +0530, Hariprasad Shenai wrote:
> 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-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
> Signed-off-by: Steve Wise <swise-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org>
> Signed-off-by: Hariprasad Shenai <hariprasad-ut6Up61K2wZBDgjK7y7TUQ@public.gmane.org>
> ---
> 
> V2: kfree_skb() checks if skb is freed, so no need to check again.
>     Based on review comments by Leon Romanovsky <leon@kernel.org>
> 
>  drivers/infiniband/hw/cxgb4/mem.c | 26 +++++++++++++++-----------
>  1 file changed, 15 insertions(+), 11 deletions(-)
> 

Thanks, applied.

-- 
Doug Ledford <dledford-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
              GPG KeyID: 0E572FDD

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