forge/linux-uconsole
1
0
Fork 0
Code Issues 1 Pull requests Projects Releases Packages Wiki Activity Actions

ovl: fix lseek overflow on 32bit

Browse source 
[ Upstream commit a4ac9d45c0 ]

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: 9e46b840c7 ("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: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Miklos Szeredi 2020-02-03 11:41:53 +01:00 • committed by Greg Kroah-Hartman
commit 4f98fe43cd
1 changed files with 1 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

2
fs/overlayfs/file.c
View file

@ -149,7 +149,7 @@ 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,