If, for any reason, the open-coded arithmetic causes a wraparound,
the protection that `struct_size()` provides against potential integer
overflows is defeated. Fix this by hardening calls to `struct_size()`
with `size_add()`, `size_sub()` and `size_mul()`.
Fixes: 467f432a521a ("RDMA/core: Split port and device counter sysfs
attributes")
Fixes: a4676388e2e2 ("RDMA/core: Simplify how the gid_attrs sysfs is created")
Fixes: e9dd5daf884c ("IB/umad: Refactor code to use cdev_device_add()")
Fixes: 324e227ea7c9 ("RDMA/device: Add ib_device_get_by_netdev()")
Fixes: 5aad26a7eac5 ("IB/core: Use struct_size() in kzalloc()")
Signed-off-by: Gustavo A. R. Silva <[email protected]>
---
Changes in v3:
- Include changes to other files in drivers/infiniband/core/
- Update changelog text with a more descriptive argument for the
changes.
- Add more `Fixes:` tags.
Changes in v2:
- Update changelog text: remove the part about binary differences (it
was added by mistake).
Link: https://lore.kernel.org/linux-hardening/ZP+if342EMhModzZ@work/
v1:
- Link: https://lore.kernel.org/linux-hardening/ZP+g+KfsEmEBAHmk@work/
drivers/infiniband/core/device.c | 2 +-
drivers/infiniband/core/sa_query.c | 4 +++-
drivers/infiniband/core/sysfs.c | 10 +++++-----
drivers/infiniband/core/user_mad.c | 4 +++-
4 files changed, 12 insertions(+), 8 deletions(-)
diff --git a/drivers/infiniband/core/device.c b/drivers/infiniband/core/device.c
index a666847bd714..010718738d04 100644
--- a/drivers/infiniband/core/device.c
+++ b/drivers/infiniband/core/device.c
@@ -804,7 +804,7 @@ static int alloc_port_data(struct ib_device *device)
* empty slots at the beginning.
*/
pdata_rcu = kzalloc(struct_size(pdata_rcu, pdata,
- rdma_end_port(device) + 1),
+ size_add(rdma_end_port(device), 1)),
GFP_KERNEL);
if (!pdata_rcu)
return -ENOMEM;
diff --git a/drivers/infiniband/core/sa_query.c
b/drivers/infiniband/core/sa_query.c
index 59179cfc20ef..8175dde60b0a 100644
--- a/drivers/infiniband/core/sa_query.c
+++ b/drivers/infiniband/core/sa_query.c
@@ -2159,7 +2159,9 @@ static int ib_sa_add_one(struct ib_device *device)
s = rdma_start_port(device);
e = rdma_end_port(device);
- sa_dev = kzalloc(struct_size(sa_dev, port, e - s + 1), GFP_KERNEL);
+ sa_dev = kzalloc(struct_size(sa_dev, port,
+ size_add(size_sub(e, s), 1)),
+ GFP_KERNEL);
if (!sa_dev)
return -ENOMEM;
diff --git a/drivers/infiniband/core/sysfs.c b/drivers/infiniband/core/sysfs.c
index ee59d7391568..ec5efdc16660 100644
--- a/drivers/infiniband/core/sysfs.c
+++ b/drivers/infiniband/core/sysfs.c
@@ -903,7 +903,7 @@ alloc_hw_stats_device(struct ib_device *ibdev)
* Two extra attribue elements here, one for the lifespan entry and
* one to NULL terminate the list for the sysfs core code
*/
- data = kzalloc(struct_size(data, attrs, stats->num_counters + 1),
+ data = kzalloc(struct_size(data, attrs, size_add(stats->num_counters,
1)),
GFP_KERNEL);
if (!data)
goto err_free_stats;
@@ -1009,7 +1009,7 @@ alloc_hw_stats_port(struct ib_port *port, struct
attribute_group *group)
* Two extra attribue elements here, one for the lifespan entry and
* one to NULL terminate the list for the sysfs core code
*/
- data = kzalloc(struct_size(data, attrs, stats->num_counters + 1),
+ data = kzalloc(struct_size(data, attrs, size_add(stats->num_counters,
1)),
GFP_KERNEL);
if (!data)
goto err_free_stats;
@@ -1140,7 +1140,7 @@ static int setup_gid_attrs(struct ib_port *port,
int ret;
gid_attr_group = kzalloc(struct_size(gid_attr_group, attrs_list,
- attr->gid_tbl_len * 2),
+ size_mul(attr->gid_tbl_len, 2)),
GFP_KERNEL);
if (!gid_attr_group)
return -ENOMEM;
@@ -1205,8 +1205,8 @@ static struct ib_port *setup_port(struct ib_core_device
*coredev, int port_num,
int ret;
p = kvzalloc(struct_size(p, attrs_list,
- attr->gid_tbl_len + attr->pkey_tbl_len),
- GFP_KERNEL);
+ size_add(attr->gid_tbl_len,
attr->pkey_tbl_len)),
+ GFP_KERNEL);
if (!p)
return ERR_PTR(-ENOMEM);
p->ibdev = device;
diff --git a/drivers/infiniband/core/user_mad.c
b/drivers/infiniband/core/user_mad.c
index 7e5c33aad161..f5feca7fa9b9 100644
--- a/drivers/infiniband/core/user_mad.c
+++ b/drivers/infiniband/core/user_mad.c
@@ -1378,7 +1378,9 @@ static int ib_umad_add_one(struct ib_device *device)
s = rdma_start_port(device);
e = rdma_end_port(device);
- umad_dev = kzalloc(struct_size(umad_dev, ports, e - s + 1), GFP_KERNEL);
+ umad_dev = kzalloc(struct_size(umad_dev, ports,
+ size_add(size_sub(e, s), 1)),
+ GFP_KERNEL);
if (!umad_dev)
return -ENOMEM;
--
2.34.1
