Commit 3ad49d37 authored by Dan Carpenter's avatar Dan Carpenter Committed by Casey Schaufler
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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: e114e473 ("Smack: Simplified Mandatory Access Control Kernel")
Signed-off-by: default avatarDan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: default avatarCasey Schaufler <casey@schaufler-ca.com>
parent c47b6584

security/smack/smackfs.c

+1 −1
Original line number Diff line number Diff line
@@ -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 &&