From 82720490628cb53a5fd41e27fcfebace27d3b5b0 Mon Sep 17 00:00:00 2001 From: Tobias Stoeckmann Date: Mon, 3 Oct 2016 21:48:31 +0200 Subject: smb: properly check incoming packet boundaries Not all reply messages were properly checked for their lengths, which made it possible to access uninitialized memory (but this does not lead to out of boundary accesses). Closes #1052 --- lib/smb.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) (limited to 'lib/smb.c') diff --git a/lib/smb.c b/lib/smb.c index 56a38c2f2..7cb0c9611 100644 --- a/lib/smb.c +++ b/lib/smb.c @@ -673,7 +673,7 @@ static CURLcode smb_connection_state(struct connectdata *conn, bool *done) switch(smbc->state) { case SMB_NEGOTIATE: - if(h->status) { + if(h->status || smbc->got < sizeof(*nrsp) + sizeof(smbc->challenge) - 1) { connclose(conn, "SMB: negotiation failed"); return CURLE_COULDNT_CONNECT; } @@ -712,6 +712,7 @@ static CURLcode smb_request_state(struct connectdata *conn, bool *done) { struct smb_request *req = conn->data->req.protop; struct smb_header *h; + struct smb_conn *smbc = &conn->proto.smbc; enum smb_req_state next_state = SMB_DONE; unsigned short len; unsigned short off; @@ -754,7 +755,7 @@ static CURLcode smb_request_state(struct connectdata *conn, bool *done) break; case SMB_OPEN: - if(h->status) { + if(h->status || smbc->got < sizeof(struct smb_nt_create_response)) { req->result = CURLE_REMOTE_FILE_NOT_FOUND; next_state = SMB_TREE_DISCONNECT; break; @@ -775,7 +776,7 @@ static CURLcode smb_request_state(struct connectdata *conn, bool *done) break; case SMB_DOWNLOAD: - if(h->status) { + if(h->status || smbc->got < sizeof(struct smb_header) + 14) { req->result = CURLE_RECV_ERROR; next_state = SMB_CLOSE; break; @@ -785,7 +786,6 @@ static CURLcode smb_request_state(struct connectdata *conn, bool *done) off = Curl_read16_le(((unsigned char *) msg) + sizeof(struct smb_header) + 13); if(len > 0) { - struct smb_conn *smbc = &conn->proto.smbc; if(off + sizeof(unsigned int) + len > smbc->got) { failf(conn->data, "Invalid input packet"); result = CURLE_RECV_ERROR; @@ -807,7 +807,7 @@ static CURLcode smb_request_state(struct connectdata *conn, bool *done) break; case SMB_UPLOAD: - if(h->status) { + if(h->status || smbc->got < sizeof(struct smb_header) + 6) { req->result = CURLE_UPLOAD_FAILED; next_state = SMB_CLOSE; break; -- cgit v1.2.3