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net/tun: fix ioctl() based info leaks

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The tun module leaks up to 36 bytes of memory by not fully initializing
a structure located on the stack that gets copied to user memory by the
TUNGETIFF and SIOCGIFHWADDR ioctl()s.

Signed-off-by: Mathias Krause <minipli@googlemail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Mathias Krause 2012-07-29 19:45:14 +00:00 committed by David S. Miller
parent cac83e5391
commit a117dacde0
1 changed files with 3 additions and 1 deletions
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4
drivers/net/tun.c
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@ -1379,9 +1379,11 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd,
int vnet_hdr_sz;
int ret;
if (cmd == TUNSETIFF || _IOC_TYPE(cmd) == 0x89)
if (cmd == TUNSETIFF || _IOC_TYPE(cmd) == 0x89) {
if (copy_from_user(&ifr, argp, ifreq_len))
return -EFAULT;
} else
memset(&ifr, 0, sizeof(ifr));
if (cmd == TUNGETFEATURES) {
/* Currently this just means: "what IFF flags are valid?".