RDMA: Directly cast the sockaddr union to sockaddr

commit 641114d2af312d39ca9bbc2369d18a5823da51c6 upstream.

gcc 9 now does allocation size tracking and thinks that passing the member
of a union and then accessing beyond that member's bounds is an overflow.

Instead of using the union member, use the entire union with a cast to
get to the sockaddr. gcc will now know that the memory extends the full
size of the union.

Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/infiniband/core/addr.c b/drivers/infiniband/core/addr.c
index 978b8d9..1baa25e 100644 (file)
--- a/drivers/infiniband/core/addr.c
+++ b/drivers/infiniband/core/addr.c
@@ -735,14 +735,13 @@ int rdma_addr_find_l2_eth_by_grh(const union ib_gid *sgid,
        struct net_device *dev;
 
        union {
-               struct sockaddr     _sockaddr;
                struct sockaddr_in  _sockaddr_in;
                struct sockaddr_in6 _sockaddr_in6;
        } sgid_addr, dgid_addr;
 
 
-       rdma_gid2ip(&sgid_addr._sockaddr, sgid);
-       rdma_gid2ip(&dgid_addr._sockaddr, dgid);
+       rdma_gid2ip((struct sockaddr *)&sgid_addr, sgid);
+       rdma_gid2ip((struct sockaddr *)&dgid_addr, dgid);
 
        memset(&dev_addr, 0, sizeof(dev_addr));
        if (if_index)
@@ -751,8 +750,9 @@ int rdma_addr_find_l2_eth_by_grh(const union ib_gid *sgid,
 
        ctx.addr = &dev_addr;
        init_completion(&ctx.comp);
-       ret = rdma_resolve_ip(&self, &sgid_addr._sockaddr, &dgid_addr._sockaddr,
-                       &dev_addr, 1000, resolve_cb, &ctx);
+       ret = rdma_resolve_ip(&self, (struct sockaddr *)&sgid_addr,
+                             (struct sockaddr *)&dgid_addr, &dev_addr, 1000,
+                             resolve_cb, &ctx);
        if (ret)
                return ret;
 
@@ -782,16 +782,15 @@ int rdma_addr_find_smac_by_sgid(union ib_gid *sgid, u8 *smac, u16 *vlan_id)
        int ret = 0;
        struct rdma_dev_addr dev_addr;
        union {
-               struct sockaddr     _sockaddr;
                struct sockaddr_in  _sockaddr_in;
                struct sockaddr_in6 _sockaddr_in6;
        } gid_addr;
 
-       rdma_gid2ip(&gid_addr._sockaddr, sgid);
+       rdma_gid2ip((struct sockaddr *)&gid_addr, sgid);
 
        memset(&dev_addr, 0, sizeof(dev_addr));
        dev_addr.net = &init_net;
-       ret = rdma_translate_ip(&gid_addr._sockaddr, &dev_addr, vlan_id);
+       ret = rdma_translate_ip((struct sockaddr *)&gid_addr, &dev_addr, vlan_id);
        if (ret)
                return ret;
 

diff --git a/drivers/infiniband/hw/ocrdma/ocrdma_ah.c b/drivers/infiniband/hw/ocrdma/ocrdma_ah.c
index 797362a..35efd40 100644 (file)
--- a/drivers/infiniband/hw/ocrdma/ocrdma_ah.c
+++ b/drivers/infiniband/hw/ocrdma/ocrdma_ah.c
@@ -82,7 +82,6 @@ static inline int set_av_attr(struct ocrdma_dev *dev, struct ocrdma_ah *ah,
        u8 nxthdr = 0x11;
        struct iphdr ipv4;
        union {
-               struct sockaddr     _sockaddr;
                struct sockaddr_in  _sockaddr_in;
                struct sockaddr_in6 _sockaddr_in6;
        } sgid_addr, dgid_addr;
@@ -131,9 +130,9 @@ static inline int set_av_attr(struct ocrdma_dev *dev, struct ocrdma_ah *ah,
                ipv4.tot_len = htons(0);
                ipv4.ttl = attr->grh.hop_limit;
                ipv4.protocol = nxthdr;
-               rdma_gid2ip(&sgid_addr._sockaddr, sgid);
+               rdma_gid2ip((struct sockaddr *)&sgid_addr, sgid);
                ipv4.saddr = sgid_addr._sockaddr_in.sin_addr.s_addr;
-               rdma_gid2ip(&dgid_addr._sockaddr, &attr->grh.dgid);
+               rdma_gid2ip((struct sockaddr *)&dgid_addr, &attr->grh.dgid);
                ipv4.daddr = dgid_addr._sockaddr_in.sin_addr.s_addr;
                memcpy((u8 *)ah->av + eth_sz, &ipv4, sizeof(struct iphdr));
        } else {

diff --git a/drivers/infiniband/hw/ocrdma/ocrdma_hw.c b/drivers/infiniband/hw/ocrdma/ocrdma_hw.c
index 67fc0b6..edfa228 100644 (file)
--- a/drivers/infiniband/hw/ocrdma/ocrdma_hw.c
+++ b/drivers/infiniband/hw/ocrdma/ocrdma_hw.c
@@ -2505,7 +2505,6 @@ static int ocrdma_set_av_params(struct ocrdma_qp *qp,
        u32 vlan_id = 0xFFFF;
        u8 mac_addr[6], hdr_type;
        union {
-               struct sockaddr     _sockaddr;
                struct sockaddr_in  _sockaddr_in;
                struct sockaddr_in6 _sockaddr_in6;
        } sgid_addr, dgid_addr;
@@ -2550,8 +2549,8 @@ static int ocrdma_set_av_params(struct ocrdma_qp *qp,
 
        hdr_type = ib_gid_to_network_type(sgid_attr.gid_type, &sgid);
        if (hdr_type == RDMA_NETWORK_IPV4) {
-               rdma_gid2ip(&sgid_addr._sockaddr, &sgid);
-               rdma_gid2ip(&dgid_addr._sockaddr, &ah_attr->grh.dgid);
+               rdma_gid2ip((struct sockaddr *)&sgid_addr, &sgid);
+               rdma_gid2ip((struct sockaddr *)&dgid_addr, &ah_attr->grh.dgid);
                memcpy(&cmd->params.dgid[0],
                       &dgid_addr._sockaddr_in.sin_addr.s_addr, 4);
                memcpy(&cmd->params.sgid[0],