linux-kernel - [PATCH 5.5 131/367] ovl: fix lseek overflow on 32bit

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Message-Id: <20200210122436.965084889@linuxfoundation.org>
Date:   Mon, 10 Feb 2020 04:30:44 -0800
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Boris Gjenero <boris.gjenero@...il.com>,
        Miklos Szeredi <mszeredi@...hat.com>
Subject: [PATCH 5.5 131/367] ovl: fix lseek overflow on 32bit

From: Miklos Szeredi <mszeredi@...hat.com>

commit a4ac9d45c0cd14a2adc872186431c79804b77dbf upstream.

ovl_lseek() is using ssize_t to return the value from vfs_llseek().  On a
32-bit kernel ssize_t is a 32-bit signed int, which overflows above 2 GB.

Assign the return value of vfs_llseek() to loff_t to fix this.

Reported-by: Boris Gjenero <boris.gjenero@...il.com>
Fixes: 9e46b840c705 ("ovl: support stacked SEEK_HOLE/SEEK_DATA")
Cc: <stable@...r.kernel.org> # v4.19
Signed-off-by: Miklos Szeredi <mszeredi@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/overlayfs/file.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/overlayfs/file.c
+++ b/fs/overlayfs/file.c
@@ -146,7 +146,7 @@ static loff_t ovl_llseek(struct file *fi
 	struct inode *inode = file_inode(file);
 	struct fd real;
 	const struct cred *old_cred;
-	ssize_t ret;
+	loff_t ret;
 
 	/*
 	 * The two special cases below do not need to involve real fs,