Fixed nasty bug where file writes with start offsets in the range

0x80000000 -> 0xFFFFFFFF would fail as they were being cast
from IVAL (uint32) to SMB_OFF_T (off_t or off64_t, both *signed* types).
The sign extension would cause the offset to be treated as negative.
Thanks to Herb for helping me track this one down (IRIX is good for large
file tests :-).
Jeremy.
PS. That horrid EXEXIST thing has broken configure.....
(This used to be commit fc7d3faed798e7496f2991ec7d795c3b1a3758f5)

1 files changed, 14 insertions, 13 deletions

diff --git a/source3/smbd/reply.c b/source3/smbd/reply.c
index 2c29ffdf51..f320bf8ff5 100644
--- a/source3/smbd/reply.c
+++ b/source3/smbd/reply.c
@@ -1532,7 +1532,7 @@ int reply_readbraw(connection_struct *conn, char *inbuf, char *outbuf, int dum_s
 
 	flush_write_cache(fsp, READRAW_FLUSH);
 
-	startpos = IVAL(inbuf,smb_vwv1);
+	startpos = IVAL_TO_SMB_OFF_T(inbuf,smb_vwv1);
 	if(CVAL(inbuf,smb_wct) == 10) {
 		/*
 		 * This is a large offset (64 bit) read.
@@ -1627,7 +1627,7 @@ int reply_lockread(connection_struct *conn, char *inbuf,char *outbuf, int length
 	release_level_2_oplocks_on_change(fsp);
 
 	numtoread = SVAL(inbuf,smb_vwv1);
-	startpos = IVAL(inbuf,smb_vwv2);
+	startpos = IVAL_TO_SMB_OFF_T(inbuf,smb_vwv2);
   
 	outsize = set_message(outbuf,5,3,True);
 	numtoread = MIN(BUFFER_SIZE-outsize,numtoread);
@@ -1696,7 +1696,7 @@ int reply_read(connection_struct *conn, char *inbuf,char *outbuf, int size, int
 	CHECK_READ(fsp);
 
 	numtoread = SVAL(inbuf,smb_vwv1);
-	startpos = IVAL(inbuf,smb_vwv2);
+	startpos = IVAL_TO_SMB_OFF_T(inbuf,smb_vwv2);
 
 	outsize = set_message(outbuf,5,3,True);
 	numtoread = MIN(BUFFER_SIZE-outsize,numtoread);
@@ -1822,7 +1822,7 @@ int send_file_readX(connection_struct *conn, char *inbuf,char *outbuf,int length
 int reply_read_and_X(connection_struct *conn, char *inbuf,char *outbuf,int length,int bufsize)
 {
 	files_struct *fsp = file_fsp(inbuf,smb_vwv2);
-	SMB_OFF_T startpos = IVAL(inbuf,smb_vwv3);
+	SMB_OFF_T startpos = IVAL_TO_SMB_OFF_T(inbuf,smb_vwv3);
 	ssize_t nread = -1;
 	size_t smb_maxcnt = SVAL(inbuf,smb_vwv5);
 #if 0
@@ -1900,7 +1900,7 @@ int reply_writebraw(connection_struct *conn, char *inbuf,char *outbuf, int size,
 	CHECK_WRITE(fsp);
   
 	tcount = IVAL(inbuf,smb_vwv1);
-	startpos = IVAL(inbuf,smb_vwv3);
+	startpos = IVAL_TO_SMB_OFF_T(inbuf,smb_vwv3);
 	write_through = BITSETW(inbuf+smb_vwv7,0);
 
 	/* We have to deal with slightly different formats depending
@@ -2030,7 +2030,7 @@ int reply_writeunlock(connection_struct *conn, char *inbuf,char *outbuf,
 	CHECK_WRITE(fsp);
 
 	numtowrite = SVAL(inbuf,smb_vwv1);
-	startpos = IVAL(inbuf,smb_vwv2);
+	startpos = IVAL_TO_SMB_OFF_T(inbuf,smb_vwv2);
 	data = smb_buf(inbuf) + 3;
   
 	if (is_locked(fsp,conn,(SMB_BIG_UINT)numtowrite,(SMB_BIG_UINT)startpos, 
@@ -2097,7 +2097,7 @@ int reply_write(connection_struct *conn, char *inbuf,char *outbuf,int size,int d
 	CHECK_WRITE(fsp);
 
 	numtowrite = SVAL(inbuf,smb_vwv1);
-	startpos = IVAL(inbuf,smb_vwv2);
+	startpos = IVAL_TO_SMB_OFF_T(inbuf,smb_vwv2);
 	data = smb_buf(inbuf) + 3;
   
 	if (is_locked(fsp,conn,(SMB_BIG_UINT)numtowrite,(SMB_BIG_UINT)startpos, WRITE_LOCK,False)) {
@@ -2158,7 +2158,7 @@ int reply_write(connection_struct *conn, char *inbuf,char *outbuf,int size,int d
 int reply_write_and_X(connection_struct *conn, char *inbuf,char *outbuf,int length,int bufsize)
 {
   files_struct *fsp = file_fsp(inbuf,smb_vwv2);
-  SMB_OFF_T startpos = IVAL(inbuf,smb_vwv3);
+  SMB_OFF_T startpos = IVAL_TO_SMB_OFF_T(inbuf,smb_vwv3);
   size_t numtowrite = SVAL(inbuf,smb_vwv10);
   BOOL write_through = BITSETW(inbuf+smb_vwv7,0);
   ssize_t nwritten = -1;
@@ -2269,7 +2269,8 @@ int reply_lseek(connection_struct *conn, char *inbuf,char *outbuf, int size, int
   flush_write_cache(fsp, SEEK_FLUSH);
 
   mode = SVAL(inbuf,smb_vwv1) & 3;
-  startpos = IVALS(inbuf,smb_vwv2);
+  /* NB. This doesn't use IVAL_TO_SMB_OFF_T as startpos can be signed in this case. */
+  startpos = (SMB_OFF_T)IVALS(inbuf,smb_vwv2);
 
   switch (mode) {
     case 0: umode = SEEK_SET; break;
@@ -2478,7 +2479,7 @@ int reply_writeclose(connection_struct *conn,
 	CHECK_WRITE(fsp);
 
 	numtowrite = SVAL(inbuf,smb_vwv1);
-	startpos = IVAL(inbuf,smb_vwv2);
+	startpos = IVAL_TO_SMB_OFF_T(inbuf,smb_vwv2);
 	mtime = make_unix_date3(inbuf+smb_vwv4);
 	data = smb_buf(inbuf) + 1;
   
@@ -4056,7 +4057,7 @@ int reply_readbmpx(connection_struct *conn, char *inbuf,char *outbuf,int length,
 	CHECK_FSP(fsp,conn);
 	CHECK_READ(fsp);
 
-	startpos = IVAL(inbuf,smb_vwv1);
+	startpos = IVAL_TO_SMB_OFF_T(inbuf,smb_vwv1);
 	maxcount = SVAL(inbuf,smb_vwv3);
 
 	data = smb_buf(outbuf);
@@ -4184,7 +4185,7 @@ int reply_writebmpx(connection_struct *conn, char *inbuf,char *outbuf, int size,
 	CHECK_ERROR(fsp);
 
 	tcount = SVAL(inbuf,smb_vwv1);
-	startpos = IVAL(inbuf,smb_vwv3);
+	startpos = IVAL_TO_SMB_OFF_T(inbuf,smb_vwv3);
 	write_through = BITSETW(inbuf+smb_vwv7,0);
 	numtowrite = SVAL(inbuf,smb_vwv10);
 	smb_doff = SVAL(inbuf,smb_vwv11);
@@ -4284,7 +4285,7 @@ int reply_writebs(connection_struct *conn, char *inbuf,char *outbuf, int dum_siz
 	CHECK_WRITE(fsp);
 
 	tcount = SVAL(inbuf,smb_vwv1);
-	startpos = IVAL(inbuf,smb_vwv2);
+	startpos = IVAL_TO_SMB_OFF_T(inbuf,smb_vwv2);
 	numtowrite = SVAL(inbuf,smb_vwv6);
 	smb_doff = SVAL(inbuf,smb_vwv7);