Hi Jason, Thanks for the feedback. Yes, you are right if the skb release is moved under err4 label it will cause a double free as c4iw_ref_send_wait will release skb in case of error. So, in order to avoid leaking skb in case of c4iw_bar2_addrs failure, the kfree(skb) could be placed under the error check like the way patch v1 did. Do you see any mistake in version 1? https://lore.kernel.org/patchwork/patch/1128510/ Thanks, Navid On Tue, Oct 1, 2019 at 8:54 AM Jason Gunthorpe <jgg@xxxxxxxx> wrote: > > On Mon, Sep 23, 2019 at 10:52:59AM -0500, Navid Emamdoost wrote: > > In create_cq, the allocated skb buffer needs to be released on error > > path. > > Moved the kfree_skb(skb) under err4 label. > > This didn't move anything > > > Signed-off-by: Navid Emamdoost <navid.emamdoost@xxxxxxxxx> > > drivers/infiniband/hw/cxgb4/cq.c | 1 + > > 1 file changed, 1 insertion(+) > > > > diff --git a/drivers/infiniband/hw/cxgb4/cq.c b/drivers/infiniband/hw/cxgb4/cq.c > > index b1bb61c65f4f..1886c1af10bc 100644 > > +++ b/drivers/infiniband/hw/cxgb4/cq.c > > @@ -173,6 +173,7 @@ static int create_cq(struct c4iw_rdev *rdev, struct t4_cq *cq, > > err4: > > dma_free_coherent(&rdev->lldi.pdev->dev, cq->memsize, cq->queue, > > dma_unmap_addr(cq, mapping)); > > + kfree_skb(skb); > > err3: > > kfree(cq->sw_queue); > > err2: > > This looks wrong to me: > > int c4iw_ofld_send(struct c4iw_rdev *rdev, struct sk_buff *skb) > { > int error = 0; > > if (c4iw_fatal_error(rdev)) { > kfree_skb(skb); > pr_err("%s - device in error state - dropping\n", __func__); > return -EIO; > } > error = cxgb4_ofld_send(rdev->lldi.ports[0], skb); > if (error < 0) > kfree_skb(skb); > return error < 0 ? error : 0; > } > > Jason -- Navid.
