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wireless: wext: terminate ifr name coming from userspace 

ifr name is assumed to be a valid string by the kernel, but nothing
was forcing username to pass a valid string.

In turn, this would cause panics as we tried to access the string
past it's valid memory.

Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Levin, Alexander 2017-07-18 04:23:16 +00:00 committed by David S. Miller
parent 073dd5ad34
commit 98de4e0ea4
1 changed files with 2 additions and 0 deletions
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2
net/core/dev_ioctl.c
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@ -424,6 +424,8 @@ int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
if (copy_from_user(&iwr, arg, sizeof(iwr)))
return -EFAULT;
iwr.ifr_name[sizeof(iwr.ifr_name) - 1] = 0;
return wext_handle_ioctl(net, &iwr, cmd, arg);
}