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The CLI command "update ssl ocsp-response" was forcefully removing an OCSP response from the update tree regardless of whether it used to be in it beforehand or not. But since the main OCSP upate task works by removing the entry being currently updated from the update tree and then reinserting it when the update process is over, it meant that in the CLI command code we were modifying a structure that was already being used. These concurrent accesses were not properly locked on the "regular" update case because it was assumed that once an entry was removed from the update tree, the update task was the only one able to work on it. Rather than locking the whole update process, an "updating" flag was added to the certificate_ocsp in order to prevent the "update ssl ocsp-response" command from trying to update a response already being updated. An easy way to reproduce this crash was to perform two "simultaneous" calls to "update ssl ocsp-response" on the same certificate. It would then crash on an eb64_delete call in the main ocsp update task function. This patch can be backported up to 2.8. |
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