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selinux: Fix a panic in selinux_netlbl_inode_permission()

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Rick McNeal from LSI identified a panic in selinux_netlbl_inode_permission()
caused by a certain sequence of SUNRPC operations.  The problem appears to be
due to the lack of NULL pointer checking in the function; this patch adds the
pointer checks so the function will exit safely in the cases where the socket
is not completely initialized.

Signed-off-by: Paul Moore <paul.moore@hp.com>
Signed-off-by: James Morris <jmorris@namei.org>
This commit is contained in:
Paul Moore 2009-02-27 15:00:03 -05:00 committed by James Morris
parent 778ef1e6cb
commit d7f59dc464
1 changed files with 3 additions and 2 deletions
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5
security/selinux/netlabel.c
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@ -386,11 +386,12 @@ int selinux_netlbl_inode_permission(struct inode *inode, int mask)
if (!S_ISSOCK(inode->i_mode) ||
((mask & (MAY_WRITE | MAY_APPEND)) == 0))
return 0;
sock = SOCKET_I(inode);
sk = sock->sk;
if (sk == NULL)
return 0;
sksec = sk->sk_security;
if (sksec->nlbl_state != NLBL_REQUIRE)
if (sksec == NULL || sksec->nlbl_state != NLBL_REQUIRE)
return 0;
local_bh_disable();