[RFC][PATCH 4/7] smack: fix label check in smack_kernel_act_as()

[Roberto Sassu]

The function smack_kernel_act_as() must return -EINVAL if the label
returned by smack_from_secid() is equal to 'smack_known_invalid.smk_known',
which means that no entries in the 'smack_known_list' list matching the
security identifier given are found.

Signed-off-by: Roberto Sassu <roberto.sassu@xxxxxxxxx>
---
 security/smack/smack_lsm.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index e3c9e54..0e7ed31 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -1415,7 +1415,7 @@ static int smack_kernel_act_as(struct cred *new, u32 secid)
 	struct task_smack *new_tsp = new->security;
 	char *smack = smack_from_secid(secid);
 
-	if (smack == NULL)
+	if (smack == smack_known_invalid.smk_known)
 		return -EINVAL;
 
 	new_tsp->smk_task = smack;
-- 
1.7.4.4

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