| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.5 131/367] ovl: fix lseek overflow on 32bit | Date | Mon, 10 Feb 2020 04:30:44 -0800 |
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From: Miklos Szeredi <mszeredi@redhat.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@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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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,
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