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diff --git a/source/smbd/process.c b/source/smbd/process.c
index e861e16..6499bc7 100644
--- a/source/smbd/process.c
+++ b/source/smbd/process.c
@@ -1159,6 +1159,7 @@ int chain_reply(char *inbuf,char *outbuf,int size,int bufsize)
{
static char *orig_inbuf;
static char *orig_outbuf;
+ static int orig_size;
int smb_com1, smb_com2 = CVAL(inbuf,smb_vwv0);
unsigned smb_off2 = SVAL(inbuf,smb_vwv1);
char *inbuf2, *outbuf2;
@@ -1178,6 +1179,13 @@ int chain_reply(char *inbuf,char *outbuf,int size,int bufsize)
/* this is the first part of the chain */
orig_inbuf = inbuf;
orig_outbuf = outbuf;
+ orig_size = size;
+ }
+
+ /* Validate smb_off2 */
+ if ((smb_off2 < smb_wct - 4) || orig_size < (smb_off2 + 4 - smb_wct)) {
+ exit_server_cleanly("Bad chained packet");
+ return -1;
}
/*
@@ -1192,6 +1200,11 @@ int chain_reply(char *inbuf,char *outbuf,int size,int bufsize)
SSVAL(outbuf,smb_vwv1,smb_offset(outbuf+outsize,outbuf));
SCVAL(outbuf,smb_vwv0,smb_com2);
+ if (outsize <= smb_wct) {
+ exit_server_cleanly("Bad chained packet");
+ return -1;
+ }
+
/* remember how much the caller added to the chain, only counting stuff
after the parameter words */
chain_size += outsize - smb_wct;
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