commit 8b981725798880a8bc8b1bee638e4285ffb7fe5a
Author: David Goulet <[email protected]>
Date: Fri Sep 11 15:09:07 2015 +0200
Add a rend cache failure info dup function
When validating a new descriptor against our rend cache failure, we were
added the failure entry to the new cache entry without duplicating. It was
then freed just after the validation ending up in a very bad memory state
that was making tor abort(). To fix this, a dup function has been added and
used just before adding the failure entry.
Fixes #17041
Signed-off-by: David Goulet <[email protected]>
---
src/or/rendcache.c | 16 +++++++++++++++-
1 file changed, 15 insertions(+), 1 deletion(-)
diff --git a/src/or/rendcache.c b/src/or/rendcache.c
index fe9a134..542d322 100644
--- a/src/or/rendcache.c
+++ b/src/or/rendcache.c
@@ -334,6 +334,17 @@ cache_failure_intro_lookup(const uint8_t *identity, const
char *service_id,
return 0;
}
+/** Allocate a new cache failure intro object and copy the content from
+ * <b>entry</b> to this newly allocated object. Return it. */
+static rend_cache_failure_intro_t *
+cache_failure_intro_dup(const rend_cache_failure_intro_t *entry)
+{
+ rend_cache_failure_intro_t *ent_dup =
+ rend_cache_failure_intro_entry_new(entry->failure_type);
+ ent_dup->created_ts = entry->created_ts;
+ return ent_dup;
+}
+
/** Add an intro point failure to the failure cache using the relay
* <b>identity</b> and service ID <b>service_id</b>. Record the
* <b>failure</b> in that object. */
@@ -383,12 +394,15 @@ validate_intro_point_failure(const
rend_service_descriptor_t *desc,
found = cache_failure_intro_lookup(identity, service_id, &entry);
if (found) {
+ /* Dup here since it will be freed at the end when removing the
+ * original entry in the cache. */
+ rend_cache_failure_intro_t *ent_dup = cache_failure_intro_dup(entry);
/* This intro point is in our cache, discard it from the descriptor
* because chances are that it's unusable. */
SMARTLIST_DEL_CURRENT(desc->intro_nodes, intro);
rend_intro_point_free(intro);
/* Keep it for our new entry. */
- digestmap_set(new_entry->intro_failures, (char *) identity, entry);
+ digestmap_set(new_entry->intro_failures, (char *) identity, ent_dup);
continue;
}
} SMARTLIST_FOREACH_END(intro);
_______________________________________________
tor-commits mailing list
[email protected]
https://lists.torproject.org/cgi-bin/mailman/listinfo/tor-commits
