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authorChengguang Xu <cgxu519@gmx.com>2018-07-19 17:15:25 +0300
committerIlya Dryomov <idryomov@gmail.com>2018-08-02 22:33:28 +0300
commit0671e9968dfb3f99a366df816c361b8e871dba1b (patch)
tree5abae989553cfe457b8da5d85af9af52ad969943 /fs/ceph
parent719784ba706cdbb47ef87483950f0a4594d36e87 (diff)
downloadlinux-0671e9968dfb3f99a366df816c361b8e871dba1b.tar.xz
ceph: add additional range check in ceph_fallocate()
If the range is larger than both real file size and limit of max file size, then return -EFBIG. Signed-off-by: Chengguang Xu <cgxu519@gmx.com> Reviewed-by: "Yan, Zheng" <zyan@redhat.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Diffstat (limited to 'fs/ceph')
-rw-r--r--fs/ceph/file.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index 2f3a30ca94bf..2c54d2674db6 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -1728,8 +1728,7 @@ static long ceph_fallocate(struct file *file, int mode,
struct ceph_file_info *fi = file->private_data;
struct inode *inode = file_inode(file);
struct ceph_inode_info *ci = ceph_inode(inode);
- struct ceph_osd_client *osdc =
- &ceph_inode_to_client(inode)->client->osdc;
+ struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
struct ceph_cap_flush *prealloc_cf;
int want, got = 0;
int dirty;
@@ -1737,6 +1736,9 @@ static long ceph_fallocate(struct file *file, int mode,
loff_t endoff = 0;
loff_t size;
+ if ((offset + length) > max(i_size_read(inode), fsc->max_file_size))
+ return -EFBIG;
+
if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
return -EOPNOTSUPP;
@@ -1760,7 +1762,7 @@ static long ceph_fallocate(struct file *file, int mode,
goto unlock;
}
- if (ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL) &&
+ if (ceph_osdmap_flag(&fsc->client->osdc, CEPH_OSDMAP_FULL) &&
!(mode & FALLOC_FL_PUNCH_HOLE)) {
ret = -ENOSPC;
goto unlock;