iw_cxgb4: Use memset_startat() for cpl_t5_pass_accept_rpl

In preparation for FORTIFY_SOURCE performing compile-time and run-time
field bounds checking for memset(), avoid intentionally writing across
neighboring fields.

Use memset_startat() so memset() doesn't get confused about writing beyond
the destination member that is intended to be the starting point of
zeroing through the end of the struct. Additionally, since everything
appears to perform a roundup (including allocation), just change the size
of the struct itself and add a build-time check to validate the expected
size.

Link: https://lore.kernel.org/r/20211213223331.135412-13-keescook@chromium.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

diff --git a/drivers/infiniband/hw/cxgb4/cm.c b/drivers/infiniband/hw/cxgb4/cm.c
index 913f39e..c16017f 100644 (file)
--- a/drivers/infiniband/hw/cxgb4/cm.c
+++ b/drivers/infiniband/hw/cxgb4/cm.c
@@ -2471,7 +2471,8 @@ static int accept_cr(struct c4iw_ep *ep, struct sk_buff *skb,
        skb_get(skb);
        rpl = cplhdr(skb);
        if (!is_t4(adapter_type)) {
-               skb_trim(skb, roundup(sizeof(*rpl5), 16));
+               BUILD_BUG_ON(sizeof(*rpl5) != roundup(sizeof(*rpl5), 16));
+               skb_trim(skb, sizeof(*rpl5));
                rpl5 = (void *)rpl;
                INIT_TP_WR(rpl5, ep->hwtid);
        } else {
@@ -2487,7 +2488,7 @@ static int accept_cr(struct c4iw_ep *ep, struct sk_buff *skb,
                opt2 |= CONG_CNTRL_V(CONG_ALG_TAHOE);
                opt2 |= T5_ISS_F;
                rpl5 = (void *)rpl;
-               memset(&rpl5->iss, 0, roundup(sizeof(*rpl5)-sizeof(*rpl), 16));
+               memset_after(rpl5, 0, iss);
                if (peer2peer)
                        isn += 4;
                rpl5->iss = cpu_to_be32(isn);

diff --git a/drivers/net/ethernet/chelsio/cxgb4/t4_msg.h b/drivers/net/ethernet/chelsio/cxgb4/t4_msg.h
index fed5f93..26433a6 100644 (file)
--- a/drivers/net/ethernet/chelsio/cxgb4/t4_msg.h
+++ b/drivers/net/ethernet/chelsio/cxgb4/t4_msg.h
@@ -497,7 +497,7 @@ struct cpl_t5_pass_accept_rpl {
        __be32 opt2;
        __be64 opt0;
        __be32 iss;
-       __be32 rsvd;
+       __be32 rsvd[3];
 };
 
 struct cpl_act_open_req {