[Xen-devel] [PATCH 10 of 12] backport fbb7b4e0804d2168f24142eebf7552adde1968dc

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

Backport fbb7b4e0804d2168f24142eebf7552adde1968dc from qemu upstream:

Improve block range checks

---

diff -r a9605b2f542b block.c
--- a/block.c   Fri Oct 02 13:41:55 2009 +0100
+++ b/block.c   Fri Oct 02 14:41:51 2009 +0100
@@ -559,7 +559,10 @@
 
     len = bdrv_getlength(bs);
 
-    if ((offset + size) > len)
+    if (offset < 0)
+        return -EIO;
+
+    if ((offset > len) || (len - offset < size))
         return -EIO;
 
     return 0;
@@ -1209,6 +1212,8 @@
        return -EIO;
     if (!drv->bdrv_write_compressed)
         return -ENOTSUP;
+    if (bdrv_check_request(bs, sector_num, nb_sectors))
+        return -EIO;
     return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors);
 }
 

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