LSM: Check for NULL cred-security on free
From: Casey Schaufler <casey@schaufler-ca.com> Check that the cred security blob has been set before trying to clean it up. There is a case during credential initialization that could result in this. Signed-off-by: Casey Schaufler <casey@schaufler-ca.com> Acked-by: John Johansen <john.johansen@canonical.com> Signed-off-by: James Morris <james.morris@microsoft.com> Reported-by: syzbot+69ca07954461f189e808@syzkaller.appspotmail.com
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@ -1027,6 +1027,13 @@ int security_cred_alloc_blank(struct cred *cred, gfp_t gfp)
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void security_cred_free(struct cred *cred)
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void security_cred_free(struct cred *cred)
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{
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{
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/*
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* There is a failure case in prepare_creds() that
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* may result in a call here with ->security being NULL.
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*/
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if (unlikely(cred->security == NULL))
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return;
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call_void_hook(cred_free, cred);
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call_void_hook(cred_free, cred);
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}
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}
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