Rewrite the wrap checks to deal with gcc 4.x optimisations.

Karolin, please pull once Volker has reviewed. Thanks.
Jeremy.
(This used to be commit 09852899cadc48abe2f2651ecbceaf881198e648)

1 files changed, 45 insertions, 33 deletions

diff --git a/source3/smbd/ipc.c b/source3/smbd/ipc.c
index 68a13d692f..6961a5caf1 100644
--- a/source3/smbd/ipc.c
+++ b/source3/smbd/ipc.c
@@ -498,7 +498,8 @@ void reply_trans(struct smb_request *req)
 	unsigned int pscnt;
 	struct trans_state *state;
 	NTSTATUS result;
-	int size;
+	unsigned int size;
+	unsigned int av_size;
 
 	START_PROFILE(SMBtrans);
 
@@ -509,6 +510,7 @@ void reply_trans(struct smb_request *req)
 	}
 
 	size = smb_len(req->inbuf) + 4;
+	av_size = smb_len(req->inbuf);
 	dsoff = SVAL(req->inbuf, smb_dsoff);
 	dscnt = SVAL(req->inbuf, smb_dscnt);
 	psoff = SVAL(req->inbuf, smb_psoff);
@@ -567,12 +569,17 @@ void reply_trans(struct smb_request *req)
 		}
 		/* null-terminate the slack space */
 		memset(&state->data[state->total_data], 0, 100);
-		if ((dsoff+dscnt < dsoff) || (dsoff+dscnt < dscnt))
+
+		if (dscnt > state->total_data ||
+				dsoff+dscnt < dsoff) {
 			goto bad_param;
-		if ((smb_base(req->inbuf)+dsoff+dscnt
-		     > (char *)req->inbuf + size) ||
-		    (smb_base(req->inbuf)+dsoff+dscnt < smb_base(req->inbuf)))
+		}
+
+		if (dsoff > av_size ||
+				dscnt > av_size ||
+				dsoff+dscnt > av_size) {
 			goto bad_param;
+		}
 
 		memcpy(state->data,smb_base(req->inbuf)+dsoff,dscnt);
 	}
@@ -592,12 +599,17 @@ void reply_trans(struct smb_request *req)
 		} 
 		/* null-terminate the slack space */
 		memset(&state->param[state->total_param], 0, 100);
-		if ((psoff+pscnt < psoff) || (psoff+pscnt < pscnt))
+
+		if (pscnt > state->total_param ||
+				psoff+pscnt < psoff) {
 			goto bad_param;
-		if ((smb_base(req->inbuf)+psoff+pscnt
-		     > (char *)req->inbuf + size) ||
-		    (smb_base(req->inbuf)+psoff+pscnt < smb_base(req->inbuf)))
+		}
+
+		if (psoff > av_size ||
+				pscnt > av_size ||
+				psoff+pscnt > av_size) {
 			goto bad_param;
+		}
 
 		memcpy(state->param,smb_base(req->inbuf)+psoff,pscnt);
 	}
@@ -675,7 +687,7 @@ void reply_transs(struct smb_request *req)
 	connection_struct *conn = req->conn;
 	unsigned int pcnt,poff,dcnt,doff,pdisp,ddisp;
 	struct trans_state *state;
-	int size;
+	unsigned int av_size;
 
 	START_PROFILE(SMBtranss);
 
@@ -708,7 +720,7 @@ void reply_transs(struct smb_request *req)
 	if (SVAL(req->inbuf, smb_vwv1) < state->total_data)
 		state->total_data = SVAL(req->inbuf,smb_vwv1);
 
-	size = smb_len(req->inbuf) + 4;
+	av_size = smb_len(req->inbuf);
 
 	pcnt = SVAL(req->inbuf, smb_spscnt);
 	poff = SVAL(req->inbuf, smb_spsoff);
@@ -726,38 +738,38 @@ void reply_transs(struct smb_request *req)
 		goto bad_param;
 		
 	if (pcnt) {
-		if (pdisp+pcnt > state->total_param)
-			goto bad_param;
-		if ((pdisp+pcnt < pdisp) || (pdisp+pcnt < pcnt))
-			goto bad_param;
-		if (pdisp > state->total_param)
+		if (pdisp > state->total_param ||
+				pcnt > state->total_param ||
+				pdisp+pcnt > state->total_param ||
+				pdisp+pcnt < pdisp) {
 			goto bad_param;
-		if ((smb_base(req->inbuf) + poff + pcnt
-		     > (char *)req->inbuf + size) ||
-		    (smb_base(req->inbuf) + poff + pcnt
-		     < smb_base(req->inbuf)))
-			goto bad_param;
-		if (state->param + pdisp < state->param)
+		}
+
+		if (poff > av_size ||
+				pcnt > av_size ||
+				poff+pcnt > av_size ||
+				poff+pcnt < poff) {
 			goto bad_param;
+		}
 
 		memcpy(state->param+pdisp,smb_base(req->inbuf)+poff,
 		       pcnt);
 	}
 
 	if (dcnt) {
-		if (ddisp+dcnt > state->total_data)
-			goto bad_param;
-		if ((ddisp+dcnt < ddisp) || (ddisp+dcnt < dcnt))
+		if (ddisp > state->total_data ||
+				dcnt > state->total_data ||
+				ddisp+dcnt > state->total_data ||
+				ddisp+dcnt < ddisp) {
 			goto bad_param;
-		if (ddisp > state->total_data)
-			goto bad_param;
-		if ((smb_base(req->inbuf) + doff + dcnt
-		     > (char *)req->inbuf + size) ||
-		    (smb_base(req->inbuf) + doff + dcnt
-		     < smb_base(req->inbuf)))
-			goto bad_param;
-		if (state->data + ddisp < state->data)
+		}
+
+		if (ddisp > av_size ||
+				dcnt > av_size ||
+				ddisp+dcnt > av_size ||
+				ddisp+dcnt < ddisp) {
 			goto bad_param;
+		}
 
 		memcpy(state->data+ddisp, smb_base(req->inbuf)+doff,
 		       dcnt);