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Smack: prevent underflow in smk_set_cipso()
[ Upstream commit42a2df3e82
] We have an upper bound on "maplevel" but forgot to check for negative values. Fixes:e114e47377
("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>
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@ -912,7 +912,7 @@ static ssize_t smk_set_cipso(struct file *file, const char __user *buf,
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}
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ret = sscanf(rule, "%d", &maplevel);
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if (ret != 1 || maplevel > SMACK_CIPSO_MAXLEVEL)
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if (ret != 1 || maplevel < 0 || maplevel > SMACK_CIPSO_MAXLEVEL)
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goto out;
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rule += SMK_DIGITLEN;
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