From: Dan Carpenter dan.carpenter@oracle.com
[ Upstream commit 42a2df3e829f3c5562090391b33714b2e2e5ad4a ]
We have an upper bound on "maplevel" but forgot to check for negative values.
Fixes: e114e473771c ("Smack: Simplified Mandatory Access Control Kernel") Signed-off-by: Dan Carpenter dan.carpenter@oracle.com Signed-off-by: Casey Schaufler casey@schaufler-ca.com Signed-off-by: Sasha Levin sashal@kernel.org --- security/smack/smackfs.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/security/smack/smackfs.c b/security/smack/smackfs.c index 2bae1fc493d16..9c4308077574c 100644 --- a/security/smack/smackfs.c +++ b/security/smack/smackfs.c @@ -884,7 +884,7 @@ static ssize_t smk_set_cipso(struct file *file, const char __user *buf, }
ret = sscanf(rule, "%d", &maplevel); - if (ret != 1 || maplevel > SMACK_CIPSO_MAXLEVEL) + if (ret != 1 || maplevel < 0 || maplevel > SMACK_CIPSO_MAXLEVEL) goto out;
rule += SMK_DIGITLEN;