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net: bridge: fix ioctl old_deviceless bridge argument

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Commit ad2f99aedf ("net: bridge: move bridge ioctls out of .ndo_do_ioctl")
changed the source of the argument copy in bridge's old_deviceless() from
args[1] (user ptr to device name) to uarg (ptr to ioctl arguments) causing
wrong device name to be used.

Example (broken, bridge exists but is up):
$ brctl delbr bridge
bridge bridge doesn't exist; can't delete it

Example (working):
$ brctl delbr bridge
bridge bridge is still up; can't delete it

Fixes: ad2f99aedf ("net: bridge: move bridge ioctls out of .ndo_do_ioctl")
Signed-off-by: Nikolay Aleksandrov <nikolay@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nikolay Aleksandrov 2021-08-05 11:29:02 +03:00 committed by David S. Miller
parent 893b195875
commit cbd7ad29a5
1 changed files with 1 additions and 1 deletions
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net/bridge/br_ioctl.c
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@ -351,7 +351,7 @@ static int old_deviceless(struct net *net, void __user *uarg)
if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
return -EPERM;
if (copy_from_user(buf, uarg, IFNAMSIZ))
if (copy_from_user(buf, (void __user *)args[1], IFNAMSIZ))
return -EFAULT;
buf[IFNAMSIZ-1] = 0;