From: Xiaogang Chen <xiaogang.chen@amd.com>
Date: Thu, 30 Oct 2025 16:08:32 +0000 (-0500)
Subject: udmabuf: fix a buf size overflow issue during udmabuf creation
X-Git-Tag: v6.12.57~3
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=29b65a3171a49c9b69f31035146be966cec40b7a;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: Amelia Crate <acrate@waldn.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/dma-buf/udmabuf.c b/drivers/dma-buf/udmabuf.c
index 0e127a9109e75..2e5c30f7ba0f4 100644
--- a/drivers/dma-buf/udmabuf.c
+++ b/drivers/dma-buf/udmabuf.c
@@ -350,7 +350,7 @@ static long udmabuf_create(struct miscdevice *device,
 		return -ENOMEM;
 
 	INIT_LIST_HEAD(&ubuf->unpin_list);
-	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 (!PAGE_ALIGNED(list[i].offset))
 			goto err;