From ea0a51bb9d96a53e0c3c510656bd2443e900339d Mon Sep 17 00:00:00 2001
From: Jianqun Xu <jay.xu@rock-chips.com>
Date: Tue, 3 Aug 2021 10:34:05 +0800
Subject: [PATCH] dma-buf: buffer should align to cacheline size

Fixes: 0f4763b1c656 ("dma-buf: add DMA_BUF_IOCTL_SYNC_PARTIAL support")
Change-Id: Iff8b633cb89337bba3f7693a28657034a6aa2223
Signed-off-by: Jianqun Xu <jay.xu@rock-chips.com>
---
 drivers/dma-buf/dma-buf.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
index bf92ce7e4e3e..8f101e83caed 100644
--- a/drivers/dma-buf/dma-buf.c
+++ b/drivers/dma-buf/dma-buf.c
@@ -39,6 +39,7 @@
 #include <linux/hashtable.h>
 #include <linux/list_sort.h>
 #include <linux/mount.h>
+#include <linux/cache.h>
 
 #include <uapi/linux/dma-buf.h>
 #include <uapi/linux/magic.h>
@@ -453,6 +454,9 @@ static long dma_buf_ioctl(struct file *file,
 		if (sync_p.len == 0)
 			return -EINVAL;
 
+		if ((sync_p.offset % cache_line_size()) || (sync_p.len % cache_line_size()))
+			return -EINVAL;
+
 		if (sync_p.len > dmabuf->size || sync_p.offset > dmabuf->size - sync_p.len)
 			return -EINVAL;