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2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/misc/fastrpc.c
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@@ -247,6 +247,13 @@
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 		dma_buf_put(map->buf);
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 	}
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+	if (map->fl) {
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+		spin_lock(&map->fl->lock);
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+		list_del(&map->node);
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+		spin_unlock(&map->fl->lock);
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+		map->fl = NULL;
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+	}
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+
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 	kfree(map);
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 }
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@@ -256,10 +263,12 @@
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 		kref_put(&map->refcount, fastrpc_free_map);
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 }
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-static void fastrpc_map_get(struct fastrpc_map *map)
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+static int fastrpc_map_get(struct fastrpc_map *map)
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 {
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-	if (map)
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-		kref_get(&map->refcount);
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+	if (!map)
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+		return -ENOENT;
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+
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+	return kref_get_unless_zero(&map->refcount) ? 0 : -ENOENT;
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 }
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 static int fastrpc_map_find(struct fastrpc_user *fl, int fd,
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@@ -1097,7 +1106,7 @@
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 	sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_CREATE, 4, 0);
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 	if (init.attrs)
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-		sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_CREATE_ATTR, 6, 0);
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+		sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_CREATE_ATTR, 4, 0);
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 	err = fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE,
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 				      sc, args);
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@@ -1112,12 +1121,7 @@
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 	fl->init_mem = NULL;
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 	fastrpc_buf_free(imem);
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 err_alloc:
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-	if (map) {
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-		spin_lock(&fl->lock);
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-		list_del(&map->node);
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-		spin_unlock(&fl->lock);
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-		fastrpc_map_put(map);
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-	}
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+	fastrpc_map_put(map);
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 err:
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 	kfree(args);
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@@ -1194,10 +1198,8 @@
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 		fastrpc_context_put(ctx);
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 	}
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-	list_for_each_entry_safe(map, m, &fl->maps, node) {
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-		list_del(&map->node);
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+	list_for_each_entry_safe(map, m, &fl->maps, node)
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 		fastrpc_map_put(map);
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-	}
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 	list_for_each_entry_safe(buf, b, &fl->mmaps, node) {
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 		list_del(&buf->node);
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@@ -1673,8 +1675,10 @@
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 	struct fastrpc_invoke_ctx *ctx;
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 	spin_lock(&user->lock);
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-	list_for_each_entry(ctx, &user->pending, node)
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+	list_for_each_entry(ctx, &user->pending, node) {
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+		ctx->retval = -EPIPE;
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 		complete(&ctx->work);
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+	}
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 	spin_unlock(&user->lock);
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 }
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@@ -1684,7 +1688,9 @@
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 	struct fastrpc_user *user;
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 	unsigned long flags;
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+	/* No invocations past this point */
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 	spin_lock_irqsave(&cctx->lock, flags);
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+	cctx->rpdev = NULL;
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 	list_for_each_entry(user, &cctx->users, user)
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 		fastrpc_notify_users(user);
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 	spin_unlock_irqrestore(&cctx->lock, flags);
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@@ -1692,7 +1698,6 @@
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 	misc_deregister(&cctx->miscdev);
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 	of_platform_depopulate(&rpdev->dev);
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-	cctx->rpdev = NULL;
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 	fastrpc_channel_ctx_put(cctx);
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 }
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