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lib: fix g_hash_table related read-after-free bug

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The two g_hash_table functions (insert, add) have different behaviour
with respect to existing keys. g_hash_table_insert frees the new key,
while g_hash_table_add (which is really g_hash_table_replace in
disguise) frees the existing key. With this change 'ref' is live until
the end of the function (assuming single-threaded access to
'hash'). We can't guarantee it will continue to be live in the
future (i.e. there may be a future key duplication) so we copy it with
the allocation context passed to parse_references (in practice this is
the notmuch_message_t object whose parents we are finding).

Thanks to Tomi for the simpler approach to the problem based on
reading the fine glib manual.
This commit is contained in:
David Bremner 2017-02-22 06:17:47 -04:00
parent 928016a4ea
commit 4e649d000b
1 changed files with 2 additions and 2 deletions
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4
lib/database.cc
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@ -652,7 +652,7 @@ parse_references (void *ctx,
ref = _parse_message_id (ctx, refs, &refs);
if (ref && strcmp (ref, message_id)) {
g_hash_table_insert (hash, ref, NULL);
g_hash_table_add (hash, ref);
last_ref = ref;
}
}
@ -661,7 +661,7 @@ parse_references (void *ctx,
* reference to the database. We should avoid making a message
* its own parent, thus the above check.
*/
return last_ref;
return talloc_strdup(ctx, last_ref);
}
notmuch_status_t