curl: Handle success in multi_check_completion

Background: As of cURL 7.59.0, it verifies that several functions are
not called from within a callback.  Among these functions is
curl_multi_add_handle().

curl_read_cb() is a callback from cURL and not a coroutine.  Waking up
acb->co will lead to entering it then and there, which means the current
request will settle and the caller (if it runs in the same coroutine)
may then issue the next request.  In such a case, we will enter
curl_setup_preadv() effectively from within curl_read_cb().

Calling curl_multi_add_handle() will then fail and the new request will
not be processed.

Fix this by not letting curl_read_cb() wake up acb->co.  Instead, leave
the whole business of settling the AIOCB objects to
curl_multi_check_completion() (which is called from our timer callback
and our FD handler, so not from any cURL callbacks).

Reported-by: Natalie Gavrielov <ngavrilo@redhat.com>
Buglink: https://bugzilla.redhat.com/show_bug.cgi?id=1740193
Cc: qemu-stable@nongnu.org
Signed-off-by: Max Reitz <mreitz@redhat.com>
Message-id: 20190910124136.10565-7-mreitz@redhat.com
Reviewed-by: John Snow <jsnow@redhat.com>
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
(cherry picked from commit bfb23b4)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>

block/curl.c

@@ -228,7 +228,6 @@ static size_t curl_read_cb(void *ptr, size_t size, size_t nmemb, void *opaque)
 {
     CURLState *s = ((CURLState*)opaque);
     size_t realsize = size * nmemb;
-    int i;
 
     trace_curl_read_cb(realsize);
 
@@ -244,32 +243,6 @@ static size_t curl_read_cb(void *ptr, size_t size, size_t nmemb, void *opaque)
     memcpy(s->orig_buf + s->buf_off, ptr, realsize);
     s->buf_off += realsize;
 
-    for(i=0; i<CURL_NUM_ACB; i++) {
-        CURLAIOCB *acb = s->acb[i];
-
-        if (!acb)
-            continue;
-
-        if ((s->buf_off >= acb->end)) {
-            size_t request_length = acb->bytes;
-
-            qemu_iovec_from_buf(acb->qiov, 0, s->orig_buf + acb->start,
-                                acb->end - acb->start);
-
-            if (acb->end - acb->start < request_length) {
-                size_t offset = acb->end - acb->start;
-                qemu_iovec_memset(acb->qiov, offset, 0,
-                                  request_length - offset);
-            }
-
-            acb->ret = 0;
-            s->acb[i] = NULL;
-            qemu_mutex_unlock(&s->s->mutex);
-            aio_co_wake(acb->co);
-            qemu_mutex_lock(&s->s->mutex);
-        }
-    }
-
 read_end:
     /* curl will error out if we do not return this value */
     return size * nmemb;
@@ -350,13 +323,14 @@ static void curl_multi_check_completion(BDRVCURLState *s)
             break;
 
         if (msg->msg == CURLMSG_DONE) {
+            int i;
             CURLState *state = NULL;
+            bool error = msg->data.result != CURLE_OK;
+
             curl_easy_getinfo(msg->easy_handle, CURLINFO_PRIVATE,
                               (char **)&state);
 
-            /* ACBs for successful messages get completed in curl_read_cb */
-            if (msg->data.result != CURLE_OK) {
-                int i;
+            if (error) {
                 static int errcount = 100;
 
                 /* Don't lose the original error message from curl, since
@@ -368,20 +342,35 @@ static void curl_multi_check_completion(BDRVCURLState *s)
                         error_report("curl: further errors suppressed");
                     }
                 }
+            }
 
-                for (i = 0; i < CURL_NUM_ACB; i++) {
-                    CURLAIOCB *acb = state->acb[i];
+            for (i = 0; i < CURL_NUM_ACB; i++) {
+                CURLAIOCB *acb = state->acb[i];
 
-                    if (acb == NULL) {
-                        continue;
-                    }
+                if (acb == NULL) {
+                    continue;
+                }
+
+                if (!error) {
+                    /* Assert that we have read all data */
+                    assert(state->buf_off >= acb->end);
+
+                    qemu_iovec_from_buf(acb->qiov, 0,
+                                        state->orig_buf + acb->start,
+                                        acb->end - acb->start);
 
-                    acb->ret = -EIO;
-                    state->acb[i] = NULL;
-                    qemu_mutex_unlock(&s->mutex);
-                    aio_co_wake(acb->co);
-                    qemu_mutex_lock(&s->mutex);
+                    if (acb->end - acb->start < acb->bytes) {
+                        size_t offset = acb->end - acb->start;
+                        qemu_iovec_memset(acb->qiov, offset, 0,
+                                          acb->bytes - offset);
+                    }
                 }
+
+                acb->ret = error ? -EIO : 0;
+                state->acb[i] = NULL;
+                qemu_mutex_unlock(&s->mutex);
+                aio_co_wake(acb->co);
+                qemu_mutex_lock(&s->mutex);
             }
 
             curl_clean_state(state);