[tor-commits] [tor/master] Fix a fun heisenbug in memoize_protover_flags()

[nickm at torproject.org]

commit 469f47ef8dc8b18104108f0437c860ec88fca6ad
Author: Nick Mathewson <nickm at torproject.org>
Date:   Wed Nov 21 07:38:38 2018 -0500

    Fix a fun heisenbug in memoize_protover_flags()
    
    After we clear the protover map for getting full, we need to
    re-create it, since we are about to use it.
    
    This is a bugfix for bug 28558. It is a bugfix for the code from
    ticket 27225, which is not in any released Tor.  Found by Google
    OSS-Fuzz, as issue 11475.
---
 src/core/or/versions.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/core/or/versions.c b/src/core/or/versions.c
index 6f8eea7a6..5d4effcaf 100644
--- a/src/core/or/versions.c
+++ b/src/core/or/versions.c
@@ -399,6 +399,7 @@ memoize_protover_summary(protover_summary_flags_t *out,
 
   if (strmap_size(protover_summary_map) >= MAX_PROTOVER_SUMMARY_MAP_LEN) {
     protover_summary_cache_free_all();
+    protover_summary_map = strmap_new();
   }
 
   const protover_summary_flags_t *cached =