From: Miklos Szeredi <mszeredi@redhat.com>
Date: Mon, 3 Feb 2020 10:41:53 +0000 (+0100)
Subject: ovl: fix lseek overflow on 32bit
X-Git-Tag: v5.6-rc1~65^2
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=a4ac9d45c0cd14a2adc872186431c79804b77dbf;p=users%2Fjedix%2Flinux-maple.git

ovl: fix lseek overflow on 32bit

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@gmail.com>
Fixes: 9e46b840c705 ("ovl: support stacked SEEK_HOLE/SEEK_DATA")
Cc: <stable@vger.kernel.org> # v4.19
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
---

diff --git a/fs/overlayfs/file.c b/fs/overlayfs/file.c
index 67ef4c8cfdc7..a5317216de73 100644
--- a/fs/overlayfs/file.c
+++ b/fs/overlayfs/file.c
@@ -157,7 +157,7 @@ static loff_t ovl_llseek(struct file *file, loff_t offset, int whence)
 	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,