ipl: Abort early if we know we will not reach the block
Signed-off-by: Helge Deller <deller@gmx.de>
diff --git a/ipl/offset.c b/ipl/offset.c
index c048461..fb2a6ff 100644
--- a/ipl/offset.c
+++ b/ipl/offset.c
@@ -23,6 +23,13 @@
if (Debug) printf("offset_read(%d, 0x%p, %d, %lld)\r\n",
fd, buf, count, devaddr);
+ /* abort early if we reach firmware limit */
+ if (disk_2gb_limit && ((devaddr + count) >> 31)) {
+ printf("offset_read(%lld): block not reachable via firmware call\r\n",
+ devaddr + count);
+ return -1;
+ }
+
/* truncate 'count' according to max device/file size */
if (o->length > 0 && devaddr < o->length && devaddr + count > o->length)
count = o->length - devaddr;
