linux-kernel - [PATCH v2] dma-buf: dma-heap: Add a size check for allocation

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Date:   Mon, 27 Dec 2021 17:51:02 +0800
From:   <guangming.cao@...iatek.com>
To:     Sumit Semwal <sumit.semwal@...aro.org>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        Liam Mark <lmark@...eaurora.org>,
        "Laura Abbott" <labbott@...hat.com>,
        Brian Starkey <Brian.Starkey@....com>,
        "John Stultz" <john.stultz@...aro.org>,
        Christian König <christian.koenig@....com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        "open list:DMA-BUF HEAPS FRAMEWORK" <linux-media@...r.kernel.org>,
        "open list:DMA-BUF HEAPS FRAMEWORK" <dri-devel@...ts.freedesktop.org>,
        "moderated list:DMA-BUF HEAPS FRAMEWORK" 
        <linaro-mm-sig@...ts.linaro.org>,
        open list <linux-kernel@...r.kernel.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>
CC:     Bo Song <bo.song@...iatek.com>, Libo Kang <libo.kang@...iatek.com>,
        jianjiao zeng <jianjiao.zeng@...iatek.com>,
        mingyuan ma <mingyuan.ma@...iatek.com>,
        Yunfei Wang <yf.wang@...iatek.com>,
        <wsd_upstream@...iatek.com>, Guangming <Guangming.Cao@...iatek.com>
Subject: [PATCH v2] dma-buf: dma-heap: Add a size check for allocation

From: Guangming <Guangming.Cao@...iatek.com>

Add a size check for allcation since the allocation size is
always less than the total DRAM size.

Signed-off-by: Guangming <Guangming.Cao@...iatek.com>
Signed-off-by: jianjiao zeng <jianjiao.zeng@...iatek.com>
---
v2: 1. update size limitation as total_dram page size.
    2. update commit message
---
 drivers/dma-buf/dma-heap.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/dma-buf/dma-heap.c b/drivers/dma-buf/dma-heap.c
index 56bf5ad01ad5..e39d2be98d69 100644
--- a/drivers/dma-buf/dma-heap.c
+++ b/drivers/dma-buf/dma-heap.c
@@ -55,6 +55,8 @@ static int dma_heap_buffer_alloc(struct dma_heap *heap, size_t len,
 	struct dma_buf *dmabuf;
 	int fd;
 
+	if (len / PAGE_SIZE > totalram_pages())
+		return -EINVAL;
 	/*
 	 * Allocations from all heaps have to begin
 	 * and end on page boundaries.
-- 
2.17.1