udmabuf: fix a buf size overflow issue during udmabuf creation

[ Upstream commit 021ba7f1babd029e714d13a6bf2571b08af96d0f ]

by casting size_limit_mb to u64  when calculate pglimit.

Signed-off-by: Xiaogang Chen<Xiaogang.Chen@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250321164126.329638-1-xiaogang.chen@amd.com
Signed-off-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/dma-buf/udmabuf.c b/drivers/dma-buf/udmabuf.c
index d1fcdd1f9aaed3313e77eb6318ee43382ce77b12..373282beeb606836d141e12bcf81effdf7d13705 100644 (file)
--- 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;