From: Pavel Shilovsky <[email protected]> commit e3d240e9d505fc67f8f8735836df97a794bbd946 upstream.
If maxBuf is not 0 but less than a size of SMB2 lock structure we can end up with a memory corruption. Signed-off-by: Pavel Shilovsky <[email protected]> Signed-off-by: Willy Tarreau <[email protected]> --- fs/cifs/smb2file.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/cifs/smb2file.c b/fs/cifs/smb2file.c index d801f63..866caf1 100644 --- a/fs/cifs/smb2file.c +++ b/fs/cifs/smb2file.c @@ -266,7 +266,7 @@ smb2_push_mandatory_locks(struct cifsFileInfo *cfile) * and check it for zero before using. */ max_buf = tlink_tcon(cfile->tlink)->ses->server->maxBuf; - if (!max_buf) { + if (max_buf < sizeof(struct smb2_lock_element)) { free_xid(xid); return -EINVAL; } -- 2.8.0.rc2.1.gbe9624a
