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Message-ID: <20211227094716.5870-1-guangming.cao@mediatek.com>
Date: Mon, 27 Dec 2021 17:47:16 +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
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