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multi: kill off remaining internal handles in curl_multi_cleanup

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- if there are pending internal handles left in the list, they are
  leftovers (from for example Doh) and must be freed.

- unlink_all_msgsent_handles() did not properly move all msgsent
  handles over to the process list as intended

Fixes a DoH memory leak found by oss-fuzz.

Add test 2101 that can reproduce and verify.

Closes #16674
This commit is contained in:
Daniel Stenberg 2025-03-11 17:40:21 +01:00
parent 41a15c8e74
commit b1faac8039
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GPG key ID: 5CC908FDB71E12C2
3 changed files with 56 additions and 4 deletions
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8
lib/multi.c
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@ -2478,7 +2478,6 @@ static CURLMcode multi_runsingle(struct Curl_multi *multi,
case MSTATE_PENDING:
case MSTATE_MSGSENT:
/* handles in these states should NOT be in this list */
DEBUGASSERT(0);
break;
default:
@ -2676,8 +2675,10 @@ CURLMcode curl_multi_perform(CURLM *m, int *running_handles)
static void unlink_all_msgsent_handles(struct Curl_multi *multi)
{
struct Curl_llist_node *e;
for(e = Curl_llist_head(&multi->msgsent); e; e = Curl_node_next(e)) {
struct Curl_llist_node *n;
for(e = Curl_llist_head(&multi->msgsent); e; e = n) {
struct Curl_easy *data = Curl_node_elem(e);
n = Curl_node_next(e);
if(data) {
DEBUGASSERT(data->mstate == MSTATE_MSGSENT);
Curl_node_remove(&data->multi_queue);
@ -2725,8 +2726,9 @@ CURLMcode curl_multi_cleanup(CURLM *m)
if(data->psl == &multi->psl)
data->psl = NULL;
#endif
if(data->state.internal)
Curl_close(&data);
}
Curl_cpool_destroy(&multi->cpool);
Curl_cshutdn_destroy(&multi->cshutdn, multi->admin);
if(multi->admin) {