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mime: improve unbinding top multipart from easy handle.

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Also avoid dangling pointers in referencing parts.
This commit is contained in:
Patrick Monnerat 2017-10-08 18:38:34 +01:00
parent dd97fd3bb3
commit b557182db1
3 changed files with 45 additions and 13 deletions
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51
lib/mime.c
View File

@ -1069,13 +1069,6 @@ static int mime_subparts_seek(void *instream, curl_off_t offset, int whence)
return result;
}
static void mime_subparts_free(void *ptr)
{
curl_mime *mime = (curl_mime *) ptr;
curl_mime_free(mime);
}
/* Release part content. */
static void cleanup_part_content(curl_mimepart *part)
{
@ -1094,6 +1087,30 @@ static void cleanup_part_content(curl_mimepart *part)
part->kind = MIMEKIND_NONE;
}
static void mime_subparts_free(void *ptr)
{
curl_mime *mime = (curl_mime *) ptr;
if(mime && mime->parent) {
mime->parent->freefunc = NULL; /* Be sure we won't be called again. */
cleanup_part_content(mime->parent); /* Avoid dangling pointer in part. */
}
curl_mime_free(mime);
}
/* Do not free subparts: unbind them. This is used for the top level only. */
static void mime_subparts_unbind(void *ptr)
{
curl_mime *mime = (curl_mime *) ptr;
if(mime && mime->parent) {
mime->parent->freefunc = NULL; /* Be sure we won't be called again. */
cleanup_part_content(mime->parent); /* Avoid dangling pointer in part. */
mime->parent = NULL;
}
}
void Curl_mime_cleanpart(curl_mimepart *part)
{
cleanup_part_content(part);
@ -1390,8 +1407,8 @@ CURLcode curl_mime_data_cb(curl_mimepart *part, curl_off_t datasize,
}
/* Set mime part content from subparts. */
CURLcode curl_mime_subparts(curl_mimepart *part,
curl_mime *subparts)
CURLcode Curl_mime_set_subparts(curl_mimepart *part,
curl_mime *subparts, int take_ownership)
{
if(!part)
return CURLE_BAD_FUNCTION_ARGUMENT;
@ -1414,7 +1431,7 @@ CURLcode curl_mime_subparts(curl_mimepart *part,
subparts->parent = part;
part->readfunc = mime_subparts_read;
part->seekfunc = mime_subparts_seek;
part->freefunc = mime_subparts_free;
part->freefunc = take_ownership? mime_subparts_free: mime_subparts_unbind;
part->arg = subparts;
part->datasize = -1;
part->kind = MIMEKIND_MULTIPART;
@ -1423,6 +1440,11 @@ CURLcode curl_mime_subparts(curl_mimepart *part,
return CURLE_OK;
}
CURLcode curl_mime_subparts(curl_mimepart *part, curl_mime *subparts)
{
return Curl_mime_set_subparts(part, subparts, TRUE);
}
/* Readback from top mime. */
/* Argument is the dummy top part. */
@ -1817,6 +1839,15 @@ void Curl_mime_cleanpart(curl_mimepart *part)
(void) part;
}
CURLcode Curl_mime_set_subparts(curl_mimepart *part,
curl_mime *subparts, int take_ownership)
{
(void) part;
(void) subparts;
(void) take_ownership;
return CURLE_NOT_BUILT_IN;
}
CURLcode Curl_mime_prepare_headers(curl_mimepart *part,
const char *contenttype,
const char *disposition,

2
lib/mime.h
View File

@ -122,6 +122,8 @@ struct curl_mimepart_s {
/* Prototypes. */
void Curl_mime_initpart(curl_mimepart *part, struct Curl_easy *easy);
void Curl_mime_cleanpart(curl_mimepart *part);
CURLcode Curl_mime_set_subparts(curl_mimepart *part,
curl_mime *subparts, int take_ownership);
CURLcode Curl_mime_prepare_headers(curl_mimepart *part,
const char *contenttype,
const char *disposition,

5
lib/url.c
View File

@ -1158,10 +1158,9 @@ CURLcode Curl_setopt(struct Curl_easy *data, CURLoption option,
/*
* Set to make us do MIME/form POST
*/
result = curl_mime_subparts(&data->set.mimepost,
va_arg(param, curl_mime *));
result = Curl_mime_set_subparts(&data->set.mimepost,
va_arg(param, curl_mime *), FALSE);
if(!result) {
data->set.mimepost.freefunc = NULL; /* Avoid free upon easy cleanup. */
data->set.httpreq = HTTPREQ_POST_MIME;
data->set.opt_no_body = FALSE; /* this is implied */
}