[PATCH AUTOSEL 5.10 02/11] udmabuf: fix a buf size overflow issue during udmabuf creation

[Sasha Levin]

From: Xiaogang Chen <xiaogang.chen at amd.com>

[ Upstream commit 021ba7f1babd029e714d13a6bf2571b08af96d0f ]

by casting size_limit_mb to u64  when calculate pglimit.

Signed-off-by: Xiaogang Chen<Xiaogang.Chen at amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250321164126.329638-1-xiaogang.chen@amd.com
Signed-off-by: Christian König <christian.koenig at amd.com>
Signed-off-by: Sasha Levin <sashal at kernel.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 14b79458ac7f4..597a92438afc1 100644
--- a/drivers/dma-buf/udmabuf.c
+++ b/drivers/dma-buf/udmabuf.c
@@ -177,7 +177,7 @@ 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