Check there is enough room for extension.
(cherry picked from commit 7d89b3bf42e4b4067371ab33ef7631434e41d1e4)
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@ -617,6 +617,8 @@ unsigned char *ssl_add_clienthello_tlsext(SSL *s, unsigned char *p, unsigned cha
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#ifndef OPENSSL_NO_HEARTBEATS
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/* Add Heartbeat extension */
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if ((limit - ret - 4 - 1) < 0)
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return NULL;
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s2n(TLSEXT_TYPE_heartbeat,ret);
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s2n(1,ret);
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/* Set mode:
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@ -844,6 +846,8 @@ unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *p, unsigned cha
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/* Add Heartbeat extension if we've received one */
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if (s->tlsext_heartbeat & SSL_TLSEXT_HB_ENABLED)
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{
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if ((limit - ret - 4 - 1) < 0)
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return NULL;
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s2n(TLSEXT_TYPE_heartbeat,ret);
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s2n(1,ret);
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/* Set mode:
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