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| author | Dan Carpenter <dan.carpenter@oracle.com> | 2020-07-23 18:23:05 +0300 |
|---|---|---|
| committer | Casey Schaufler <casey@schaufler-ca.com> | 2020-07-27 23:35:12 +0300 |
| commit | 42a2df3e829f3c5562090391b33714b2e2e5ad4a (patch) | |
| tree | 673418527d96c2f8fc17db77214bd477b4cc0e92 /security/smack/smackfs.c | |
| parent | a6bd4f6d9b07452b0b19842044a6c3ea384b0b88 (diff) | |
| download | linux-42a2df3e829f3c5562090391b33714b2e2e5ad4a.tar.xz | |
Smack: prevent underflow in smk_set_cipso()
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>
Diffstat (limited to 'security/smack/smackfs.c')
| -rw-r--r-- | security/smack/smackfs.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/security/smack/smackfs.c b/security/smack/smackfs.c index 2bae1fc493d1..9c4308077574 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; |