linux-kernel - [PATCH 6/7] btrfs: Promote to unsigned long long before shifting

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Message-Id: <20201004180428.14494-7-willy@infradead.org>
Date:   Sun,  4 Oct 2020 19:04:27 +0100
From:   "Matthew Wilcox (Oracle)" <willy@...radead.org>
To:     linux-fsdevel@...r.kernel.org
Cc:     "Matthew Wilcox (Oracle)" <willy@...radead.org>, ericvh@...il.com,
        lucho@...kov.net, viro@...iv.linux.org.uk, jlayton@...nel.org,
        idryomov@...il.com, mark@...heh.com, jlbec@...lplan.org,
        joseph.qi@...ux.alibaba.com, v9fs-developer@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org, ceph-devel@...r.kernel.org,
        ocfs2-devel@....oracle.com, linux-btrfs@...r.kernel.org,
        clm@...com, josef@...icpanda.com, dsterba@...e.com,
        stable@...r.kernel.org
Subject: [PATCH 6/7] btrfs: Promote to unsigned long long before shifting

On 32-bit systems, this shift will overflow for files larger than 4GB.

Cc: stable@...r.kernel.org
Fixes: 53b381b3abeb ("Btrfs: RAID5 and RAID6")
Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
---
 fs/btrfs/raid56.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/btrfs/raid56.c b/fs/btrfs/raid56.c
index 255490f42b5d..5ee0a53301bd 100644
--- a/fs/btrfs/raid56.c
+++ b/fs/btrfs/raid56.c
@@ -1089,7 +1089,7 @@ static int rbio_add_io_page(struct btrfs_raid_bio *rbio,
 	u64 disk_start;
 
 	stripe = &rbio->bbio->stripes[stripe_nr];
-	disk_start = stripe->physical + (page_index << PAGE_SHIFT);
+	disk_start = stripe->physical + ((loff_t)page_index << PAGE_SHIFT);
 
 	/* if the device is missing, just fail this stripe */
 	if (!stripe->dev->bdev)
-- 
2.28.0