--- /opt/kernel/linux-2.5.1-pre2/drivers/scsi/sr.c	Wed Nov 28 09:13:59 2001
+++ drivers/scsi/sr.c	Wed Nov 28 15:33:25 2001
@@ -326,11 +326,14 @@
 	}
 	if (old_sg) {
 		memcpy(sg + i, old_sg, SCpnt->use_sg * sizeof(struct scatterlist));
-		memcpy(bbpnt + i, old_bbpnt, SCpnt->use_sg * sizeof(void *));
+		if (old_bbpnt)
+			memcpy(bbpnt + i, old_bbpnt, SCpnt->use_sg * sizeof(void *));
 		scsi_free(old_sg, (((SCpnt->use_sg * sizeof(struct scatterlist)) +
 				    (SCpnt->use_sg * sizeof(void *))) + 511) & ~511);
 	} else {
-		sg[i].address = SCpnt->request_buffer;
+		sg[i].address = NULL;
+		sg[i].page = virt_to_page(SCpnt->request_buffer);
+		sg[i].offset = (unsigned long) SCpnt->request_buffer&~PAGE_MASK;
 		sg[i].length = SCpnt->request_bufflen;
 	}
 
@@ -340,7 +343,9 @@
 	SCpnt->use_sg += i;
 
 	if (bsize) {
-		sg[SCpnt->use_sg].address = back;
+		sg[SCpnt->use_sg].address = NULL;
+		sg[SCpnt->use_sg].page = virt_to_page(back);
+		sg[SCpnt->use_sg].offset = (unsigned long) back & ~PAGE_MASK;
 		bbpnt[SCpnt->use_sg] = back;
 		sg[SCpnt->use_sg].length = bsize;
 		SCpnt->use_sg++;