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| author | David Howells <dhowells@redhat.com> | 2022-08-23 14:07:55 +0100 |
|---|---|---|
| committer | Steve French <stfrench@microsoft.com> | 2022-08-28 22:34:08 -0500 |
| commit | 9c8b7a293f50253e694f19161c045817a938e551 (patch) | |
| tree | 0f9cc697706ca1dbbbab416a7980431298b3a20a | |
| parent | fa30a81f255a56cccd89552cd6ce7ea6e8d8acc4 (diff) | |
| download | linux-9c8b7a293f50253e694f19161c045817a938e551.tar.gz linux-9c8b7a293f50253e694f19161c045817a938e551.tar.bz2 linux-9c8b7a293f50253e694f19161c045817a938e551.zip | |
smb3: fix temporary data corruption in insert range
insert range doesn't discard the affected cached region
so can risk temporarily corrupting file data.
Also includes some minor cleanup (avoiding rereading
inode size repeatedly unnecessarily) to make it clearer.
Cc: stable@vger.kernel.org
Fixes: 7fe6fe95b936 ("cifs: add FALLOC_FL_INSERT_RANGE support")
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
| -rw-r--r-- | fs/cifs/smb2ops.c | 24 |
1 files changed, 16 insertions, 8 deletions
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c index 5b5ddc1b4638..7c941ce1e7a9 100644 --- a/fs/cifs/smb2ops.c +++ b/fs/cifs/smb2ops.c @@ -3722,35 +3722,43 @@ static long smb3_insert_range(struct file *file, struct cifs_tcon *tcon, struct cifsFileInfo *cfile = file->private_data; struct inode *inode = file_inode(file); __le64 eof; - __u64 count; + __u64 count, old_eof; xid = get_xid(); - if (off >= i_size_read(inode)) { + inode_lock(inode); + + old_eof = i_size_read(inode); + if (off >= old_eof) { rc = -EINVAL; goto out; } - count = i_size_read(inode) - off; - eof = cpu_to_le64(i_size_read(inode) + len); + count = old_eof - off; + eof = cpu_to_le64(old_eof + len); + filemap_invalidate_lock(inode->i_mapping); filemap_write_and_wait(inode->i_mapping); + truncate_pagecache_range(inode, off, old_eof); rc = SMB2_set_eof(xid, tcon, cfile->fid.persistent_fid, cfile->fid.volatile_fid, cfile->pid, &eof); if (rc < 0) - goto out; + goto out_2; rc = smb2_copychunk_range(xid, cfile, cfile, off, count, off + len); if (rc < 0) - goto out; + goto out_2; - rc = smb3_zero_range(file, tcon, off, len, 1); + rc = smb3_zero_data(file, tcon, off, len, xid); if (rc < 0) - goto out; + goto out_2; rc = 0; +out_2: + filemap_invalidate_unlock(inode->i_mapping); out: + inode_unlock(inode); free_xid(xid); return rc; } |