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Subject[PATCH 4.14 08/33] RDMA: Directly cast the sockaddr union to sockaddr
Date
From: Jason Gunthorpe <jgg@mellanox.com>

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>

---
drivers/infiniband/core/addr.c | 15 +++++++--------
drivers/infiniband/hw/ocrdma/ocrdma_ah.c | 5 ++---
drivers/infiniband/hw/ocrdma/ocrdma_hw.c | 5 ++---
3 files changed, 11 insertions(+), 14 deletions(-)

--- a/drivers/infiniband/core/addr.c
+++ b/drivers/infiniband/core/addr.c
@@ -794,14 +794,13 @@ int rdma_addr_find_l2_eth_by_grh(const u
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)
@@ -810,8 +809,9 @@ int rdma_addr_find_l2_eth_by_grh(const u

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;

@@ -841,16 +841,15 @@ int rdma_addr_find_smac_by_sgid(union ib
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;

--- a/drivers/infiniband/hw/ocrdma/ocrdma_ah.c
+++ b/drivers/infiniband/hw/ocrdma/ocrdma_ah.c
@@ -83,7 +83,6 @@ static inline int set_av_attr(struct ocr
struct iphdr ipv4;
const struct ib_global_route *ib_grh;
union {
- struct sockaddr _sockaddr;
struct sockaddr_in _sockaddr_in;
struct sockaddr_in6 _sockaddr_in6;
} sgid_addr, dgid_addr;
@@ -133,9 +132,9 @@ static inline int set_av_attr(struct ocr
ipv4.tot_len = htons(0);
ipv4.ttl = ib_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, &ib_grh->dgid);
+ rdma_gid2ip((struct sockaddr*)&dgid_addr, &ib_grh->dgid);
ipv4.daddr = dgid_addr._sockaddr_in.sin_addr.s_addr;
memcpy((u8 *)ah->av + eth_sz, &ipv4, sizeof(struct iphdr));
} else {
--- a/drivers/infiniband/hw/ocrdma/ocrdma_hw.c
+++ b/drivers/infiniband/hw/ocrdma/ocrdma_hw.c
@@ -2508,7 +2508,6 @@ static int ocrdma_set_av_params(struct o
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;
@@ -2556,8 +2555,8 @@ static int ocrdma_set_av_params(struct o

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, &grh->dgid);
+ rdma_gid2ip((struct sockaddr *)&sgid_addr, &sgid);
+ rdma_gid2ip((struct sockaddr *)&dgid_addr, &grh->dgid);
memcpy(&cmd->params.dgid[0],
&dgid_addr._sockaddr_in.sin_addr.s_addr, 4);
memcpy(&cmd->params.sgid[0],

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