gfapi: fix incorrect initialization of upcall syncop arguments

While sending upcall notifications via synctasks, the argument used to
carry relevant data for these tasks is not initialized properly. This patch
is to fix the same.

Change-Id: I9fa8f841e71d3c37d3819fbd430382928c07176c
fixes: bz#1718316
Signed-off-by: Soumya Koduri <skoduri@redhat.com>

api/src/glfs-fops.c

@@ -34,7 +34,7 @@
 
 struct upcall_syncop_args {
     struct glfs *fs;
-    struct gf_upcall *upcall_data;
+    struct glfs_upcall *up_arg;
 };
 
 #define READDIRBUF_SIZE (sizeof(struct dirent) + GF_NAME_MAX + 1)
@@ -5713,13 +5713,29 @@ out:
     return ret;
 }
 
+static int
+upcall_syncop_args_free(struct upcall_syncop_args *args)
+{
+    if (args && args->up_arg)
+        GLFS_FREE(args->up_arg);
+    GF_FREE(args);
+    return 0;
+}
+
 static int
 glfs_upcall_syncop_cbk(int ret, call_frame_t *frame, void *opaque)
 {
     struct upcall_syncop_args *args = opaque;
 
-    GF_FREE(args->upcall_data);
-    GF_FREE(args);
+    /* Here we not using upcall_syncop_args_free as application
+     * will be cleaning up the args->up_arg using glfs_free
+     * post processing upcall.
+     */
+    if (ret) {
+        upcall_syncop_args_free(args);
+    } else
+        GF_FREE(args);
+
     return 0;
 }
 
@@ -5727,13 +5743,29 @@ static int
 glfs_cbk_upcall_syncop(void *opaque)
 {
     struct upcall_syncop_args *args = opaque;
-    int ret = -1;
     struct glfs_upcall *up_arg = NULL;
     struct glfs *fs;
-    struct gf_upcall *upcall_data;
 
     fs = args->fs;
-    upcall_data = args->upcall_data;
+    up_arg = args->up_arg;
+
+    if (fs->up_cbk && up_arg) {
+        (fs->up_cbk)(up_arg, fs->up_data);
+        return 0;
+    }
+
+    return -1;
+}
+
+static struct upcall_syncop_args *
+upcall_syncop_args_init(struct glfs *fs, struct gf_upcall *upcall_data)
+{
+    struct upcall_syncop_args *args = NULL;
+    int ret = -1;
+    struct glfs_upcall *up_arg = NULL;
+
+    if (!fs || !upcall_data)
+        goto out;
 
     up_arg = GLFS_CALLOC(1, sizeof(struct gf_upcall), glfs_release_upcall,
                          glfs_mt_upcall_entry_t);
@@ -5754,49 +5786,22 @@ glfs_cbk_upcall_syncop(void *opaque)
             errno = EINVAL;
     }
 
-    if (!ret && (up_arg->reason != GLFS_UPCALL_EVENT_NULL)) {
-        /* It could so happen that the file which got
-         * upcall notification may have got deleted by
-         * the same client. In such cases up_arg->reason
-         * is set to GLFS_UPCALL_EVENT_NULL. No need to
-         * send upcall then */
-        (fs->up_cbk)(up_arg, fs->up_data);
-    } else if (up_arg->reason == GLFS_UPCALL_EVENT_NULL) {
+    /* It could so happen that the file which got
+     * upcall notification may have got deleted by
+     * the same client. In such cases up_arg->reason
+     * is set to GLFS_UPCALL_EVENT_NULL. No need to
+     * send upcall then
+     */
+    if (up_arg->reason == GLFS_UPCALL_EVENT_NULL) {
         gf_msg(THIS->name, GF_LOG_DEBUG, errno, API_MSG_INVALID_ENTRY,
                "Upcall_EVENT_NULL received. Skipping it.");
         goto out;
-    } else {
+    } else if (ret) {
         gf_msg(THIS->name, GF_LOG_ERROR, errno, API_MSG_INVALID_ENTRY,
                "Upcall entry validation failed.");
         goto out;
     }
 
-    /* application takes care of calling glfs_free on up_arg post
-     * their processing */
-    ret = 0;
-
-out:
-    if (ret && up_arg) {
-        GLFS_FREE(up_arg);
-    }
-
-    return 0;
-}
-
-static void
-glfs_cbk_upcall_data(struct glfs *fs, struct gf_upcall *upcall_data)
-{
-    struct upcall_syncop_args *args = NULL;
-    int ret = -1;
-
-    if (!fs || !upcall_data)
-        goto out;
-
-    if (!(fs->upcall_events & upcall_data->event_type)) {
-        /* ignore events which application hasn't registered*/
-        goto out;
-    }
-
     args = GF_CALLOC(1, sizeof(struct upcall_syncop_args),
                      glfs_mt_upcall_entry_t);
     if (!args) {
@@ -5814,7 +5819,38 @@ glfs_cbk_upcall_data(struct glfs *fs, struct gf_upcall *upcall_data)
      * notification without taking any lock/ref.
      */
     args->fs = fs;
-    args->upcall_data = gf_memdup(upcall_data, sizeof(*upcall_data));
+    args->up_arg = up_arg;
+
+    /* application takes care of calling glfs_free on up_arg post
+     * their processing */
+
+    return args;
+out:
+    if (up_arg) {
+        GLFS_FREE(up_arg);
+    }
+
+    return NULL;
+}
+
+static void
+glfs_cbk_upcall_data(struct glfs *fs, struct gf_upcall *upcall_data)
+{
+    struct upcall_syncop_args *args = NULL;
+    int ret = -1;
+
+    if (!fs || !upcall_data)
+        goto out;
+
+    if (!(fs->upcall_events & upcall_data->event_type)) {
+        /* ignore events which application hasn't registered*/
+        goto out;
+    }
+
+    args = upcall_syncop_args_init(fs, upcall_data);
+
+    if (!args)
+        goto out;
 
     ret = synctask_new(THIS->ctx->env, glfs_cbk_upcall_syncop,
                        glfs_upcall_syncop_cbk, NULL, args);
@@ -5823,8 +5859,7 @@ glfs_cbk_upcall_data(struct glfs *fs, struct gf_upcall *upcall_data)
         gf_msg(THIS->name, GF_LOG_ERROR, errno, API_MSG_UPCALL_SYNCOP_FAILED,
                "Synctak for Upcall event_type(%d) and gfid(%s) failed",
                upcall_data->event_type, (char *)(upcall_data->gfid));
-        GF_FREE(args->upcall_data);
-        GF_FREE(args);
+        upcall_syncop_args_free(args);
     }
 
 out: