Changeset 5d9257cf for protocols

Timestamp:

2023-04-07T20:43:51Z (13 months ago)

Author:

GitHub <noreply@…>

Branches:

master

Children:

cad74fb

Parents:

d36ef38

git-author:

dx <dx@…> (07-04-23 20:43:51)

git-committer:

GitHub <noreply@…> (07-04-23 20:43:51)

Message:

jabber: fix regression with gchecksum in jabber_cache_add (#186)

This crashed with "The checksum '%s' has been closed and cannot be
updated anymore." (which is also a user after free)

Issue introduced in 1bdc6696aefb617873b56001f81d649d6ca3aa8e which is
not in any released version.

There was this md5_digest_keep() function that freed a copy of the
checksum instead of the one you pass. The code that it was replaced with
ignored this distinction, and since jabber_cache_add() needs to reuse the
GChecksum this led to this issue.

No other place in the bitlbee code used this function.

File:

• protocols/jabber/jabber_util.c (modified) (2 diffs)

protocols/jabber/jabber_util.c

@@ -140 +140 @@
         struct jabber_data *jd = ic->proto_data;
         struct jabber_cache_entry *entry = g_new0(struct jabber_cache_entry, 1);
-        GChecksum *id_hash;
+        GChecksum *id_hash, *copy;
         gsize digest_len = MD5_HASH_SIZE;
         guint8 id_sum[MD5_HASH_SIZE];
@@ -149 +149 @@
         id_hash = jd->cached_id_prefix;
         g_checksum_update(id_hash, (guint8 *) &next_id, sizeof(next_id));
-        g_checksum_get_digest(id_hash, id_sum, &digest_len);
-        g_checksum_free(id_hash);
+
+        copy = g_checksum_copy(id_hash);
+        g_checksum_get_digest(copy, id_sum, &digest_len);
+        g_checksum_free(copy);
 
         asc_hash = base64_encode(id_sum, 12);