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| author | Dan Carpenter <dan.carpenter@linaro.org> | 2023-07-06 08:52:39 +0300 |
|---|---|---|
| committer | Casey Schaufler <casey@schaufler-ca.com> | 2023-08-07 14:09:23 -0700 |
| commit | 3ad49d37cf5759c3b8b68d02e3563f633d9c1aee (patch) | |
| tree | 1c1ce8e2546ca1d443aed397d939b92efd3c2b84 /security | |
| parent | c47b65840024153f6a1c931d6c7c772b3482a0a4 (diff) | |
| download | linux-3ad49d37cf5759c3b8b68d02e3563f633d9c1aee.tar.gz linux-3ad49d37cf5759c3b8b68d02e3563f633d9c1aee.tar.bz2 linux-3ad49d37cf5759c3b8b68d02e3563f633d9c1aee.zip | |
smackfs: Prevent underflow in smk_set_cipso()
There is a upper bound to "catlen" but no lower bound to prevent
negatives. I don't see that this necessarily causes a problem but we
may as well be safe.
Fixes: e114e473771c ("Smack: Simplified Mandatory Access Control Kernel")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
Diffstat (limited to 'security')
| -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 2b79c30d4bb6..e22aad7604e8 100644 --- a/security/smack/smackfs.c +++ b/security/smack/smackfs.c @@ -896,7 +896,7 @@ static ssize_t smk_set_cipso(struct file *file, const char __user *buf, } ret = sscanf(rule, "%d", &catlen); - if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM) + if (ret != 1 || catlen < 0 || catlen > SMACK_CIPSO_MAXCATNUM) goto out; if (format == SMK_FIXED24_FMT && |