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Pavel Orehov reported memory problems with the multi interface in bug report

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#1098843. In short, a shared DNS cache was setup for a multi handle and when
the shared cache was deleted before the individual easy handles, the latter
cleanups caused read/writes to already freed memory.
This commit is contained in:
Daniel Stenberg
2005-01-10 10:07:07 +00:00
parent 83bab78bda
commit 21bb852750
8 changed files with 101 additions and 2 deletions
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11
lib/multi.c
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@@ -43,6 +43,7 @@
#include "connect.h"
#include "progress.h"
#include "memory.h"
#include "easy.h"
/* The last #include file should be: */
#include "memdebug.h"
@@ -174,6 +175,8 @@ CURLMcode curl_multi_add_handle(CURLM *multi_handle,
if(easy->next)
easy->next->prev = easy;
Curl_easy_addmulti(easy_handle, multi_handle);
/* increase the node-counter */
multi->num_easy++;
@@ -584,6 +587,13 @@ CURLMcode curl_multi_perform(CURLM *multi_handle, int *running_handles)
return result;
}
/* This is called when an easy handle is cleanup'ed that is part of a multi
handle */
void Curl_multi_rmeasy(void *multi_handle, CURL *easy_handle)
{
curl_multi_remove_handle(multi_handle, easy_handle);
}
CURLMcode curl_multi_cleanup(CURLM *multi_handle)
{
struct Curl_multi *multi=(struct Curl_multi *)multi_handle;
@@ -600,6 +610,7 @@ CURLMcode curl_multi_cleanup(CURLM *multi_handle)
nexteasy=easy->next;
/* clear out the usage of the shared DNS cache */
easy->easy_handle->hostcache = NULL;
easy->easy_handle->multi = NULL;
if (easy->msg)
free(easy->msg);