This is a note to let you know that I've just added the patch titled
net: bridge: Use array_size() helper in copy_to_user()
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:
net-bridge-use-array_size-helper-in-copy_to_user.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 92e509ceb8674e14d64b8ade9bdcb5b476ae881c
Author: Gustavo A. R. Silva <gustavoars@xxxxxxxxxx>
Date: Tue Sep 28 15:12:39 2021 -0500
net: bridge: Use array_size() helper in copy_to_user()
[ Upstream commit 865bfb2affa8eff5182b29aa90803a2df4409834 ]
Use array_size() helper instead of the open-coded version in
copy_to_user(). These sorts of multiplication factors need
to be wrapped in array_size().
Link: https://github.com/KSPP/linux/issues/160
Signed-off-by: Gustavo A. R. Silva <gustavoars@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/net/bridge/br_ioctl.c b/net/bridge/br_ioctl.c
index 793b0db9d9a36..49c268871fc11 100644
--- a/net/bridge/br_ioctl.c
+++ b/net/bridge/br_ioctl.c
@@ -71,7 +71,8 @@ static int get_fdb_entries(struct net_bridge *br, void __user *userbuf,
num = br_fdb_fillbuf(br, buf, maxnum, offset);
if (num > 0) {
- if (copy_to_user(userbuf, buf, num*sizeof(struct __fdb_entry)))
+ if (copy_to_user(userbuf, buf,
+ array_size(num, sizeof(struct __fdb_entry))))
num = -EFAULT;
}
kfree(buf);
@@ -188,7 +189,7 @@ int br_dev_siocdevprivate(struct net_device *dev, struct ifreq *rq, void __user
return -ENOMEM;
get_port_ifindices(br, indices, num);
- if (copy_to_user(argp, indices, num * sizeof(int)))
+ if (copy_to_user(argp, indices, array_size(num, sizeof(int))))
num = -EFAULT;
kfree(indices);
return num;
@@ -336,7 +337,8 @@ static int old_deviceless(struct net *net, void __user *uarg)
args[2] = get_bridge_ifindices(net, indices, args[2]);
- ret = copy_to_user(uarg, indices, args[2]*sizeof(int))
+ ret = copy_to_user(uarg, indices,
+ array_size(args[2], sizeof(int)))
? -EFAULT : args[2];
kfree(indices);
