Always ensure that init_msg is initialised for a CCS#1847
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mattcaswell wants to merge 1 commit intoopenssl:masterfrom
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Always ensure that init_msg is initialised for a CCS#1847mattcaswell wants to merge 1 commit intoopenssl:masterfrom
mattcaswell wants to merge 1 commit intoopenssl:masterfrom
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We read it later in grow_init_buf(). If CCS is the first thing received in a flight, then it will use the init_msg from the last flight we received. If the init_buf has been grown in the meantime then it will point to some arbitrary other memory location. This is likely to result in grow_init_buf() attempting to grow to some excessively large amount which is likely to fail. In practice this should never happen because the only time we receive a CCS as the first thing in a flight is in an abbreviated handshake. None of the preceding messages from the server flight would be large enough to trigger this.
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richsalz
approved these changes
Nov 4, 2016
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Merged. Thanks. |
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Description of change
We don't initialise init_msg for a CCS, but we read it later in grow_init_buf(). If CCS is the first thing received in a flight, then it will use the init_msg from the last flight we received. If the init_buf has been grown in the meantime then it will point to some arbitrary other memory location. This is likely to result in grow_init_buf() attempting to grow to some excessively large amount which is likely to fail. In practice this should never happen because the only time we receive a CCS as the first thing in a flight is in an abbreviated handshake. None of the preceding messages from the server flight would be large enough to trigger this. However this bug is causing a problem for the TLS1.3 work and should be fixed anyway.