From fd2bac966783a9aa3f278cc67219920384bc0981 Mon Sep 17 00:00:00 2001 From: Volker Lendecke Date: Wed, 19 Nov 2008 22:55:06 +0100 Subject: For read&x replies, check the offset --- source3/libsmb/clireadwrite.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/source3/libsmb/clireadwrite.c b/source3/libsmb/clireadwrite.c index ecf49396d1..1c2a0d56c4 100644 --- a/source3/libsmb/clireadwrite.c +++ b/source3/libsmb/clireadwrite.c @@ -109,6 +109,7 @@ NTSTATUS cli_read_andx_recv(struct async_req *req, ssize_t *received, uint16_t *vwv; uint16_t num_bytes; uint8_t *bytes; + uint8_t *buf; NTSTATUS status; size_t size; @@ -136,6 +137,24 @@ NTSTATUS cli_read_andx_recv(struct async_req *req, ssize_t *received, return NT_STATUS_UNEXPECTED_IO_ERROR; } + /* + * bcc field must be valid for small reads, for large reads the 16-bit + * bcc field can't be correct. + */ + + if ((size < 0xffff) && (size > num_bytes)) { + DEBUG(5, ("server announced more bytes than sent\n")); + return NT_STATUS_INVALID_NETWORK_RESPONSE; + } + + buf = (uint8_t *)smb_base(cli_req->inbuf) + SVAL(vwv+6, 0); + + if (trans_oob(smb_len(cli_req->inbuf), SVAL(vwv+6, 0), size) + || (buf < bytes)) { + DEBUG(5, ("server returned invalid read&x data offset\n")); + return NT_STATUS_INVALID_NETWORK_RESPONSE; + } + *rcvbuf = (uint8_t *)(smb_base(cli_req->inbuf) + SVAL(vwv + 6, 0)); *received = size; return NT_STATUS_OK; -- cgit