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authorBen Hutchings <bhutchings@solarflare.com>2013-11-18 17:04:58 +0000
committerBen Hutchings <bhutchings@solarflare.com>2013-11-18 23:50:12 +0000
commit417c3522b3202dacce4873cfb0190459fbce95c5 (patch)
treed5b85dd1d60098c6231bfef3af00a4a176fb2a70 /net/socket.c
parente1bd1dc207dae92cdb5b424226f89d1b4e4bb182 (diff)
downloadlinux-417c3522b3202dacce4873cfb0190459fbce95c5.tar.bz2
net/compat: Fix minor information leak in siocdevprivate_ioctl()
We don't need to check that ifr_data itself is a valid user pointer, but we should check &ifr_data is. Thankfully the copy of ifr_name is checked, so this can only leak a few bytes from immediately above the user address limit. Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Diffstat (limited to 'net/socket.c')
-rw-r--r--net/socket.c7
1 files changed, 2 insertions, 5 deletions
diff --git a/net/socket.c b/net/socket.c
index c226aceee65b..fbb6ec13b1f4 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -3015,19 +3015,16 @@ static int siocdevprivate_ioctl(struct net *net, unsigned int cmd,
if (copy_from_user(&tmp_buf[0], &(u_ifreq32->ifr_ifrn.ifrn_name[0]),
IFNAMSIZ))
return -EFAULT;
- if (__get_user(data32, &u_ifreq32->ifr_ifru.ifru_data))
+ if (get_user(data32, &u_ifreq32->ifr_ifru.ifru_data))
return -EFAULT;
data64 = compat_ptr(data32);
u_ifreq64 = compat_alloc_user_space(sizeof(*u_ifreq64));
- /* Don't check these user accesses, just let that get trapped
- * in the ioctl handler instead.
- */
if (copy_to_user(&u_ifreq64->ifr_ifrn.ifrn_name[0], &tmp_buf[0],
IFNAMSIZ))
return -EFAULT;
- if (__put_user(data64, &u_ifreq64->ifr_ifru.ifru_data))
+ if (put_user(data64, &u_ifreq64->ifr_ifru.ifru_data))
return -EFAULT;
return dev_ioctl(net, cmd, u_ifreq64);