| Message ID | 5613F684.3020904@dev.mellanox.co.il (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
> On Oct 6, 2015, at 12:27 PM, Sagi Grimberg <sagig@dev.mellanox.co.il> wrote: > >> On 10/6/2015 6:05 PM, Chuck Lever wrote: >> Hi Sagi- >> >> >>> On Oct 6, 2015, at 5:48 AM, Sagi Grimberg <sagig@mellanox.com> wrote: >>> >>> There is no need to require LOCAL_DMA_LKEY support in order to >>> use fast registration as the PD allocation makes sure that there >>> is a local_dma_lkey. >> >> In other words, all devices now have a local DMA lkey, so the >> check is unnecessary. > > Right. > >> >> >>> This caused a NULL pointer dereference in mlx5 which removed >>> the support for LOCAL_DMA_LKEY. >> >> Where was the bad dereference? in mlx5, or in xprtrdma? > > xprtrdma, ia->ri_ops wasn't assigned correctly. > > Now that I look at it, one error path in rpcrdma_ia_open misses > an rc assignment. That needs to be fixed too, should it be in the same > patch? Go for it. > > diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c > index 7efd9ef..81e8d31 100644 > --- a/net/sunrpc/xprtrdma/verbs.c > +++ b/net/sunrpc/xprtrdma/verbs.c > @@ -554,6 +554,7 @@ rpcrdma_ia_open(struct rpcrdma_xprt *xprt, struct sockaddr *addr, int memreg) > if (!ia->ri_device->alloc_fmr) { > dprintk("RPC: %s: MTHCAFMR registration " > "not supported by HCA\n", __func__); > + rc = -EINVAL; > goto out3; > } > } > -- > > the incorrect requirement + missing rc caused the NULL deref of > ia->ri_ops. > -- > To unsubscribe from this list: send the line "unsubscribe linux-rdma" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c index 7efd9ef..81e8d31 100644 --- a/net/sunrpc/xprtrdma/verbs.c +++ b/net/sunrpc/xprtrdma/verbs.c @@ -554,6 +554,7 @@ rpcrdma_ia_open(struct rpcrdma_xprt *xprt, struct sockaddr *addr, int memreg) if (!ia->ri_device->alloc_fmr) { dprintk("RPC: %s: MTHCAFMR registration " "not supported by HCA\n", __func__); + rc = -EINVAL; goto out3; }