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)

4 files changed, 26 insertions, 23 deletions

diff --git a/source3/include/includes.h b/source3/include/includes.h
index a7dd967bf3..9ea6e91bdf 100644
--- a/source3/include/includes.h
+++ b/source3/include/includes.h
@@ -589,9 +589,11 @@ typedef int socklen_t;
 #ifdef LARGE_SMB_OFF_T
 #define SOFF_T(p, ofs, v) (SIVAL(p,ofs,(v)&0xFFFFFFFF), SIVAL(p,(ofs)+4,(v)>>32))
 #define SOFF_T_R(p, ofs, v) (SIVAL(p,(ofs)+4,(v)&0xFFFFFFFF), SIVAL(p,ofs,(v)>>32))
+#define IVAL_TO_SMB_OFF_T(buf,off) ((SMB_OFF_T)(( ((SMB_BIG_UINT)(IVAL((buf),(off)))) & ((SMB_BIG_UINT)0xFFFFFFFF) )))
 #else 
 #define SOFF_T(p, ofs, v) (SIVAL(p,ofs,v),SIVAL(p,(ofs)+4,0))
 #define SOFF_T_R(p, ofs, v) (SIVAL(p,(ofs)+4,v),SIVAL(p,ofs,0))
+#define IVAL_TO_SMB_OFF_T(buf,off) ((SMB_OFF_T)(( ((uint32)(IVAL((buf),(off)))) & 0xFFFFFFFF )))
 #endif
 
 /*
diff --git a/source3/smbd/blocking.c b/source3/smbd/blocking.c
index 9d411711cb..14239272c2 100644
--- a/source3/smbd/blocking.c
+++ b/source3/smbd/blocking.c
@@ -267,20 +267,20 @@ static BOOL process_lockread(blocking_lock_record *blr)
 	ssize_t nread = -1;
 	char *data, *p;
 	int outsize = 0;
-	SMB_OFF_T startpos;
+	SMB_BIG_UINT startpos;
 	size_t numtoread;
 	NTSTATUS status;
 	connection_struct *conn = conn_find(SVAL(inbuf,smb_tid));
 	files_struct *fsp = blr->fsp;
 
 	numtoread = SVAL(inbuf,smb_vwv1);
-	startpos = IVAL(inbuf,smb_vwv2);
+	startpos = (SMB_BIG_UINT)IVAL(inbuf,smb_vwv2);
 	
 	numtoread = MIN(BUFFER_SIZE-outsize,numtoread);
 	data = smb_buf(outbuf) + 3;
  
 	status = do_lock_spin( fsp, conn, SVAL(inbuf,smb_pid), (SMB_BIG_UINT)numtoread, 
-			  (SMB_BIG_UINT)startpos, READ_LOCK);
+			  startpos, READ_LOCK);
 	if (NT_STATUS_V(status)) {
 		if (!NT_STATUS_EQUAL(status,NT_STATUS_LOCK_NOT_GRANTED) &&
 			!NT_STATUS_EQUAL(status,NT_STATUS_FILE_LOCK_CONFLICT)) {
@@ -337,17 +337,17 @@ static BOOL process_lock(blocking_lock_record *blr)
 	char *outbuf = OutBuffer;
 	char *inbuf = blr->inbuf;
 	int outsize;
-	SMB_OFF_T count = 0, offset = 0;
+	SMB_BIG_UINT count = (SMB_BIG_UINT)0, offset = (SMB_BIG_UINT)0;
 	NTSTATUS status;
 	connection_struct *conn = conn_find(SVAL(inbuf,smb_tid));
 	files_struct *fsp = blr->fsp;
 
-	count = IVAL(inbuf,smb_vwv1);
-	offset = IVAL(inbuf,smb_vwv3);
+	count = IVAL_TO_SMB_OFF_T(inbuf,smb_vwv1);
+	offset = IVAL_TO_SMB_OFF_T(inbuf,smb_vwv3);
 
 	errno = 0;
-	status = do_lock_spin(fsp, conn, SVAL(inbuf,smb_pid), (SMB_BIG_UINT)count, 
-			 (SMB_BIG_UINT)offset, WRITE_LOCK);
+	status = do_lock_spin(fsp, conn, SVAL(inbuf,smb_pid), count, 
+			 offset, WRITE_LOCK);
 	if (NT_STATUS_IS_ERR(status)) {
 		if (!NT_STATUS_EQUAL(status,NT_STATUS_LOCK_NOT_GRANTED) &&
 			!NT_STATUS_EQUAL(status,NT_STATUS_FILE_LOCK_CONFLICT)) {
diff --git a/source3/smbd/nttrans.c b/source3/smbd/nttrans.c
index 1f3bbd488e..8aecd63de0 100644
--- a/source3/smbd/nttrans.c
+++ b/source3/smbd/nttrans.c
@@ -1304,9 +1304,9 @@ static int call_nt_transact_create(connection_struct *conn,
 	restore_case_semantics(file_attributes);
 
 	/* Save the requested allocation size. */
-	allocation_size = IVAL(params,12);
+	allocation_size = IVAL_TO_SMB_OFF_T(params,12);
 #ifdef LARGE_SMB_OFF_T
-	allocation_size |= (((SMB_OFF_T)IVAL(params,16)) << 32);
+	allocation_size |= ((IVAL_TO_SMB_OFF_T(params,16)) << 32);
 #endif
 	if (allocation_size && (allocation_size > file_len)) {
 		fsp->initial_allocation_size = SMB_ROUNDUP(allocation_size,SMB_ROUNDUP_ALLOCATION_SIZE);
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);