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eap-gtc: limit password length to maximum
The password for EAP-GTC is directly used in an EAP response. The response buffer is created on the stack so an overly large password could cause a stack overflow.
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@ -32,6 +32,8 @@
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#include "src/eap.h"
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#include "src/eap.h"
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#include "src/eap-private.h"
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#include "src/eap-private.h"
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#define EAP_GTC_MAX_PASSWORD_LEN 2048
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struct eap_gtc_state {
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struct eap_gtc_state {
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char *password;
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char *password;
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};
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};
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@ -148,6 +150,14 @@ static bool eap_gtc_load_settings(struct eap_state *eap,
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return false;
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return false;
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}
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}
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/*
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* Limit length to prevent a stack overflow
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*/
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if (strlen(password) > EAP_GTC_MAX_PASSWORD_LEN) {
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l_free(password);
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return false;
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}
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gtc = l_new(struct eap_gtc_state, 1);
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gtc = l_new(struct eap_gtc_state, 1);
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gtc->password = password;
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gtc->password = password;
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