diff -urN 2.2.15pre19/arch/mips/baget/vacserial.c 2.2.15pre19-readproc/arch/mips/baget/vacserial.c
--- 2.2.15pre19/arch/mips/baget/vacserial.c	Mon Jan 17 16:44:34 2000
+++ 2.2.15pre19-readproc/arch/mips/baget/vacserial.c	Fri Apr 21 17:34:41 2000
@@ -2162,7 +2162,7 @@
 done:
 	if (off >= len+begin)
 		return 0;
-	*start = page + (begin-off);
+	*start = page + (off-begin);
 	return ((count < begin+len-off) ? count : begin+len-off);
 }
 
diff -urN 2.2.15pre19/arch/ppc/8xx_io/uart.c 2.2.15pre19-readproc/arch/ppc/8xx_io/uart.c
--- 2.2.15pre19/arch/ppc/8xx_io/uart.c	Mon Jan 17 16:44:35 2000
+++ 2.2.15pre19-readproc/arch/ppc/8xx_io/uart.c	Fri Apr 21 17:34:41 2000
@@ -2050,7 +2050,7 @@
 done:
 	if (off >= len+begin)
 		return 0;
-	*start = page + (begin-off);
+	*start = page + (off-begin);
 	return ((count < begin+len-off) ? count : begin+len-off);
 }
 
diff -urN 2.2.15pre19/drivers/char/ip2main.c 2.2.15pre19-readproc/drivers/char/ip2main.c
--- 2.2.15pre19/drivers/char/ip2main.c	Fri Apr 21 15:59:21 2000
+++ 2.2.15pre19-readproc/drivers/char/ip2main.c	Fri Apr 21 17:34:33 2000
@@ -3175,7 +3175,7 @@
 	if (off >= len+begin)
 		return 0;
 
-	*start = page + (begin-off);
+	*start = page + (off-begin);
 	return ((count < begin+len-off) ? count : begin+len-off);
  }
  
diff -urN 2.2.15pre19/drivers/char/nvram.c 2.2.15pre19-readproc/drivers/char/nvram.c
--- 2.2.15pre19/drivers/char/nvram.c	Mon Jan 17 16:44:37 2000
+++ 2.2.15pre19-readproc/drivers/char/nvram.c	Fri Apr 21 17:34:33 2000
@@ -373,7 +373,7 @@
 
     if (offset >= begin + len)
 		return( 0 );
-    *start = buffer + (begin - offset);
+    *start = buffer + (offset - begin);
     return( size < begin + len - offset ? size : begin + len - offset );
 	
 }
diff -urN 2.2.15pre19/drivers/char/serial.c 2.2.15pre19-readproc/drivers/char/serial.c
--- 2.2.15pre19/drivers/char/serial.c	Fri Apr 21 15:59:21 2000
+++ 2.2.15pre19-readproc/drivers/char/serial.c	Fri Apr 21 17:35:28 2000
@@ -2782,29 +2782,31 @@
 	return ret;
 }
 
-int rs_read_proc(char *page, char **start, off_t off, int count,
+int rs_read_proc(char *page, char **start, off_t idx, ssize_t count,
 		 int *eof, void *data)
 {
-	int i, len = 0, l;
-	off_t	begin = 0;
+	int n;
 
-	len += sprintf(page, "serinfo:1.0 driver:%s\n", serial_version);
-	for (i = 0; i < NR_PORTS && len < 3900; i++) {
-		l = line_info(page + len, &rs_table[i]);
-		len += l;
-		if (len+begin > off+count)
-			goto done;
-		if (len+begin < off) {
-			begin += len;
-			len = 0;
-		}
+	*start = (char *) 1L;
+
+	if (!idx) {
+		n = sprintf(page, "serinfo:1.0 driver:%s\n", serial_version);
+		goto out;
 	}
-	*eof = 1;
-done:
-	if (off >= len+begin)
-		return 0;
-	*start = page + (begin-off);
-	return ((count < begin+len-off) ? count : begin+len-off);
+	idx--;
+
+	n = 0;
+	if (idx >= NR_PORTS || idx < 0)
+		goto out;
+
+	n = line_info(page, &rs_table[idx]);
+	if (idx + 1 == NR_PORTS)
+		*eof = 1;
+
+ out:
+	if (n > count)
+		n = 0;
+	return n;
 }
 
 /*
diff -urN 2.2.15pre19/drivers/char/synclink.c 2.2.15pre19-readproc/drivers/char/synclink.c
--- 2.2.15pre19/drivers/char/synclink.c	Fri Apr 21 15:59:21 2000
+++ 2.2.15pre19-readproc/drivers/char/synclink.c	Fri Apr 21 17:34:33 2000
@@ -3902,7 +3902,7 @@
 done:
 	if (off >= len+begin)
 		return 0;
-	*start = page + (begin-off);
+	*start = page + (off-begin);
 	return ((count < begin+len-off) ? count : begin+len-off);
 	
 }	/* end of mgsl_read_proc() */
diff -urN 2.2.15pre19/drivers/isdn/avmb1/capi.c 2.2.15pre19-readproc/drivers/isdn/avmb1/capi.c
--- 2.2.15pre19/drivers/isdn/avmb1/capi.c	Fri Apr 21 15:59:21 2000
+++ 2.2.15pre19-readproc/drivers/isdn/avmb1/capi.c	Fri Apr 21 17:34:41 2000
@@ -564,7 +564,7 @@
 		*eof = 1;
 	if (off >= len+begin)
 		return 0;
-	*start = page + (begin-off);
+	*start = page + (off-begin);
 	return ((count < begin+len-off) ? count : begin+len-off);
 }
 
diff -urN 2.2.15pre19/drivers/isdn/avmb1/kcapi.c 2.2.15pre19-readproc/drivers/isdn/avmb1/kcapi.c
--- 2.2.15pre19/drivers/isdn/avmb1/kcapi.c	Fri Apr 21 15:59:21 2000
+++ 2.2.15pre19-readproc/drivers/isdn/avmb1/kcapi.c	Fri Apr 21 17:45:12 2000
@@ -250,7 +250,7 @@
 		*eof = 1;
 	if (off >= len+begin)
 		return 0;
-	*start = page + (begin-off);
+	*start = page + (off-begin);
 	return ((count < begin+len-off) ? count : begin+len-off);
 }
 
@@ -289,7 +289,7 @@
 		*eof = 1;
 	if (off >= len+begin)
 		return 0;
-	*start = page + (begin-off);
+	*start = page + (off-begin);
 	return ((count < begin+len-off) ? count : begin+len-off);
 }
 
diff -urN 2.2.15pre19/drivers/sbus/char/sab82532.c 2.2.15pre19-readproc/drivers/sbus/char/sab82532.c
--- 2.2.15pre19/drivers/sbus/char/sab82532.c	Fri Apr 21 15:59:22 2000
+++ 2.2.15pre19-readproc/drivers/sbus/char/sab82532.c	Fri Apr 21 17:34:41 2000
@@ -2065,7 +2065,7 @@
 done:
 	if (off >= len+begin)
 		return 0;
-	*start = page + (begin-off);
+	*start = page + (off-begin);
 	return ((count < begin+len-off) ? count : begin+len-off);
 }
 
diff -urN 2.2.15pre19/drivers/sbus/char/su.c 2.2.15pre19-readproc/drivers/sbus/char/su.c
--- 2.2.15pre19/drivers/sbus/char/su.c	Fri Apr 21 15:59:22 2000
+++ 2.2.15pre19-readproc/drivers/sbus/char/su.c	Fri Apr 21 17:34:41 2000
@@ -2207,7 +2207,7 @@
 done:
 	if (off >= len+begin)
 		return 0;
-	*start = page + (begin-off);
+	*start = page + (off-begin);
 	return ((count < begin+len-off) ? count : begin+len-off);
 }
 
diff -urN 2.2.15pre19/fs/proc/generic.c 2.2.15pre19-readproc/fs/proc/generic.c
--- 2.2.15pre19/fs/proc/generic.c	Mon Jan 17 16:44:43 2000
+++ 2.2.15pre19-readproc/fs/proc/generic.c	Fri Apr 21 19:31:39 2000
@@ -198,9 +198,13 @@
 {
     switch (orig) {
     case 0:
+	if (offset < 0)
+	    return -EINVAL;    
 	file->f_pos = offset;
 	return(file->f_pos);
     case 1:
+	if (offset + file->f_pos < 0)
+	    return -EINVAL;    
 	file->f_pos += offset;
 	return(file->f_pos);
     case 2:
diff -urN 2.2.15pre19/fs/proc/proc_tty.c 2.2.15pre19-readproc/fs/proc/proc_tty.c
--- 2.2.15pre19/fs/proc/proc_tty.c	Mon Jan 17 16:44:43 2000
+++ 2.2.15pre19-readproc/fs/proc/proc_tty.c	Fri Apr 21 17:34:33 2000
@@ -93,7 +93,7 @@
 		*eof = 1;
 	if (off >= len+begin)
 		return 0;
-	*start = page + (begin-off);
+	*start = page + (off-begin);
 	return ((count < begin+len-off) ? count : begin+len-off);
 }
 
@@ -123,7 +123,7 @@
 		*eof = 1;
 	if (off >= len+begin)
 		return 0;
-	*start = page + (begin-off);
+	*start = page + (off-begin);
 	return ((count < begin+len-off) ? count : begin+len-off);
 }
 
diff -urN 2.2.15pre19/net/irda/ircomm/ircomm_tty.c 2.2.15pre19-readproc/net/irda/ircomm/ircomm_tty.c
--- 2.2.15pre19/net/irda/ircomm/ircomm_tty.c	Fri Apr 21 15:59:25 2000
+++ 2.2.15pre19-readproc/net/irda/ircomm/ircomm_tty.c	Fri Apr 21 17:34:33 2000
@@ -1347,7 +1347,7 @@
 done:
         if (offset >= count+begin)
                 return 0;
-        *start = buf + (begin-offset);
+        *start = buf + (offset-begin);
         return ((len < begin+count-offset) ? len : begin+count-offset);
 }