From: Xiaogang Chen <xiaogang.chen@amd.com>
Date: Fri, 21 Mar 2025 16:41:26 +0000 (-0500)
Subject: udmabuf: fix a buf size overflow issue during udmabuf creation
X-Git-Tag: v5.4.293~9
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e84a08fc7e25cdad5d9a3def42cc770ff711193f;p=thirdparty%2Fkernel%2Fstable.git

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 ae42e98cf8350..dfb572282097b 100644
--- a/drivers/dma-buf/udmabuf.c
+++ b/drivers/dma-buf/udmabuf.c
@@ -138,7 +138,7 @@ static long udmabuf_create(const struct udmabuf_create_list *head,
 	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;