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AST-2022-005: pjproject - undefined behavior after freeing a dialog set

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ASTERISK-29945 #close

Change-Id: Ia8ce6d82b115c82c1138747c72a0adcaa42b718c
This commit is contained in:
Kevin Harwell
2022-03-03 16:42:55 -06:00
committed by Kevin Harwell
parent ac8de6e31d
commit f9cd83ff35
1 changed files with 114 additions and 0 deletions
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114
third-party/pjproject/patches/0171-dialog-set-free.patch vendored Normal file
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@@ -0,0 +1,114 @@
From db3235953baa56d2fb0e276ca510fefca751643f Mon Sep 17 00:00:00 2001
From: Nanang Izzuddin <nanang@teluu.com>
Date: Mon, 21 Feb 2022 06:24:52 +0700
Subject: [PATCH] Merge pull request from GHSA-ffff-m5fm-qm62
* Update pjsip_ua_unregister_dlg():
- update the hash key if the dialog being unregistered is used as hash key.
- add an assertion check to make sure that the dlg_set to be removed is valid (can be found in the hash table).
* Change hash key string comparison method.
---
pjsip/src/pjsip/sip_ua_layer.c | 48 +++++++++++++++++++++++++++++-----
1 file changed, 42 insertions(+), 6 deletions(-)
diff --git a/pjsip/src/pjsip/sip_ua_layer.c b/pjsip/src/pjsip/sip_ua_layer.c
index 59c2524ba..5d79882a1 100644
--- a/pjsip/src/pjsip/sip_ua_layer.c
+++ b/pjsip/src/pjsip/sip_ua_layer.c
@@ -65,6 +65,9 @@ struct dlg_set
/* This is the buffer to store this entry in the hash table. */
pj_hash_entry_buf ht_entry;
+ /* Entry key in the hash table */
+ pj_str_t ht_key;
+
/* List of dialog in this dialog set. */
struct dlg_set_head dlg_list;
};
@@ -327,6 +330,7 @@ PJ_DEF(pj_status_t) pjsip_ua_register_dlg( pjsip_user_agent *ua,
* Create the dialog set and add this dialog to it.
*/
dlg_set = alloc_dlgset_node();
+ dlg_set->ht_key = dlg->local.info->tag;
pj_list_init(&dlg_set->dlg_list);
pj_list_push_back(&dlg_set->dlg_list, dlg);
@@ -334,8 +338,8 @@ PJ_DEF(pj_status_t) pjsip_ua_register_dlg( pjsip_user_agent *ua,
/* Register the dialog set in the hash table. */
pj_hash_set_np_lower(mod_ua.dlg_table,
- dlg->local.info->tag.ptr,
- (unsigned)dlg->local.info->tag.slen,
+ dlg_set->ht_key.ptr,
+ (unsigned)dlg_set->ht_key.slen,
dlg->local.tag_hval, dlg_set->ht_entry,
dlg_set);
}
@@ -345,14 +349,15 @@ PJ_DEF(pj_status_t) pjsip_ua_register_dlg( pjsip_user_agent *ua,
struct dlg_set *dlg_set;
dlg_set = alloc_dlgset_node();
+ dlg_set->ht_key = dlg->local.info->tag;
pj_list_init(&dlg_set->dlg_list);
pj_list_push_back(&dlg_set->dlg_list, dlg);
dlg->dlg_set = dlg_set;
pj_hash_set_np_lower(mod_ua.dlg_table,
- dlg->local.info->tag.ptr,
- (unsigned)dlg->local.info->tag.slen,
+ dlg_set->ht_key.ptr,
+ (unsigned)dlg_set->ht_key.slen,
dlg->local.tag_hval, dlg_set->ht_entry, dlg_set);
}
@@ -397,12 +402,43 @@ PJ_DEF(pj_status_t) pjsip_ua_unregister_dlg( pjsip_user_agent *ua,
/* If dialog list is empty, remove the dialog set from the hash table. */
if (pj_list_empty(&dlg_set->dlg_list)) {
- pj_hash_set_lower(NULL, mod_ua.dlg_table, dlg->local.info->tag.ptr,
- (unsigned)dlg->local.info->tag.slen,
+
+ /* Verify that the dialog set is valid */
+ pj_assert(pj_hash_get_lower(mod_ua.dlg_table, dlg_set->ht_key.ptr,
+ (unsigned)dlg_set->ht_key.slen,
+ &dlg->local.tag_hval) == dlg_set);
+
+ pj_hash_set_lower(NULL, mod_ua.dlg_table, dlg_set->ht_key.ptr,
+ (unsigned)dlg_set->ht_key.slen,
dlg->local.tag_hval, NULL);
/* Return dlg_set to free nodes. */
pj_list_push_back(&mod_ua.free_dlgset_nodes, dlg_set);
+ } else {
+ /* If the just unregistered dialog is being used as hash key,
+ * reset the dlg_set entry with a new key (i.e: from the first dialog
+ * in dlg_set).
+ */
+ if (dlg_set->ht_key.ptr == dlg->local.info->tag.ptr &&
+ dlg_set->ht_key.slen == dlg->local.info->tag.slen)
+ {
+ pjsip_dialog* key_dlg = dlg_set->dlg_list.next;
+
+ /* Verify that the old & new keys share the hash value */
+ pj_assert(key_dlg->local.tag_hval == dlg->local.tag_hval);
+
+ pj_hash_set_lower(NULL, mod_ua.dlg_table, dlg_set->ht_key.ptr,
+ (unsigned)dlg_set->ht_key.slen,
+ dlg->local.tag_hval, NULL);
+
+ dlg_set->ht_key = key_dlg->local.info->tag;
+
+ pj_hash_set_np_lower(mod_ua.dlg_table,
+ dlg_set->ht_key.ptr,
+ (unsigned)dlg_set->ht_key.slen,
+ key_dlg->local.tag_hval, dlg_set->ht_entry,
+ dlg_set);
+ }
}
/* Unlock user agent. */
--
2.25.1