linux-kernel - [PATCH AUTOSEL 6.6 03/24] udmabuf: fix a buf size overflow issue during udmabuf creation

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Message-Id: <20250414132957.680250-3-sashal@kernel.org>
Date: Mon, 14 Apr 2025 09:29:36 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Xiaogang Chen <xiaogang.chen@....com>,
	Xiaogang Chen <Xiaogang.Chen@....com>,
	Christian König <christian.koenig@....com>,
	Sasha Levin <sashal@...nel.org>,
	kraxel@...hat.com,
	vivek.kasireddy@...el.com,
	sumit.semwal@...aro.org,
	dri-devel@...ts.freedesktop.org,
	linux-media@...r.kernel.org,
	linaro-mm-sig@...ts.linaro.org
Subject: [PATCH AUTOSEL 6.6 03/24] udmabuf: fix a buf size overflow issue during udmabuf creation

From: Xiaogang Chen <xiaogang.chen@....com>

[ Upstream commit 021ba7f1babd029e714d13a6bf2571b08af96d0f ]

by casting size_limit_mb to u64  when calculate pglimit.

Signed-off-by: Xiaogang Chen<Xiaogang.Chen@....com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250321164126.329638-1-xiaogang.chen@amd.com
Signed-off-by: Christian König <christian.koenig@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/dma-buf/udmabuf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/dma-buf/udmabuf.c b/drivers/dma-buf/udmabuf.c
index d1fcdd1f9aaed..373282beeb606 100644
--- a/drivers/dma-buf/udmabuf.c
+++ b/drivers/dma-buf/udmabuf.c
@@ -214,7 +214,7 @@ static long udmabuf_create(struct miscdevice *device,
 	if (!ubuf)
 		return -ENOMEM;
 
-	pglimit = (size_limit_mb * 1024 * 1024) >> PAGE_SHIFT;
+	pglimit = ((u64)size_limit_mb * 1024 * 1024) >> PAGE_SHIFT;
 	for (i = 0; i < head->count; i++) {
 		if (!IS_ALIGNED(list[i].offset, PAGE_SIZE))
 			goto err;
-- 
2.39.5