Patch "RDMA/core: Use size_{add,sub,mul}() in calls to struct_size()" has been added to the 5.15-stable tree

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This is a note to let you know that I've just added the patch titled

    RDMA/core: Use size_{add,sub,mul}() in calls to struct_size()

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     rdma-core-use-size_-add-sub-mul-in-calls-to-struct_s.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 4194d26e5a49ffb3de4f8a8481a1784ad1e96e82
Author: Gustavo A. R. Silva <gustavoars@xxxxxxxxxx>
Date:   Sun Sep 17 15:21:36 2023 -0600

    RDMA/core: Use size_{add,sub,mul}() in calls to struct_size()
    
    [ Upstream commit 81760bedc65194ff38e1e4faefd5f9f0c95c19a4 ]
    
    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 <gustavoars@xxxxxxxxxx>
    Link: https://lore.kernel.org/r/ZQdt4NsJFwwOYxUR@work
    Signed-off-by: Leon Romanovsky <leon@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/infiniband/core/device.c b/drivers/infiniband/core/device.c
index ab2106a09f9c6..2c2ac63b39c42 100644
--- a/drivers/infiniband/core/device.c
+++ b/drivers/infiniband/core/device.c
@@ -803,7 +803,7 @@ 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 c00f8e28aab75..1557c71dd152f 100644
--- a/drivers/infiniband/core/sa_query.c
+++ b/drivers/infiniband/core/sa_query.c
@@ -2132,7 +2132,9 @@ 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 253ccaf343f69..afc59048c40c8 100644
--- a/drivers/infiniband/core/sysfs.c
+++ b/drivers/infiniband/core/sysfs.c
@@ -902,7 +902,7 @@ 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;
@@ -1001,7 +1001,7 @@ 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;
@@ -1125,7 +1125,7 @@ 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;
@@ -1190,8 +1190,8 @@ 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 a61c9ede43387..5c284dfbe6923 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;
 



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