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agp: info leak in agpioc_info_wrap()

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On 64 bit systems the agp_info struct has a 4 byte hole between
->agp_mode and ->aper_base.  We need to clear it to avoid disclosing
stack information to userspace.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Dan Carpenter 2014-05-03 23:27:00 +03:00 committed by Dave Airlie
parent 0384dcae2b
commit 3cf0b0311e
1 changed files with 1 additions and 0 deletions
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drivers/char/agp/frontend.c
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@ -730,6 +730,7 @@ static int agpioc_info_wrap(struct agp_file_private *priv, void __user *arg)
agp_copy_info(agp_bridge, &kerninfo);
memset(&userinfo, 0, sizeof(userinfo));
userinfo.version.major = kerninfo.version.major;
userinfo.version.minor = kerninfo.version.minor;
userinfo.bridge_id = kerninfo.device->vendor |