[Qemu-devel] [PATCH v3 2/3] qemu-io: Respect early image end for map

[Max Reitz]

bdrv_is_allocated() may report zero clusters which most probably means
the image (file) is shorter than expected. Respect this case in order to
avoid an infinite loop.

Signed-off-by: Max Reitz <mre...@redhat.com>
Reviewed-by: Eric Blake <ebl...@redhat.com>
Reviewed-by: Benoît Canet <benoit.ca...@nodalink.com>
Reviewed-by: Kevin Wolf <kw...@redhat.com>
---
 qemu-io-cmds.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/qemu-io-cmds.c b/qemu-io-cmds.c
index b224ede..d94fb1e 100644
--- a/qemu-io-cmds.c
+++ b/qemu-io-cmds.c
@@ -1900,7 +1900,7 @@ static int map_is_allocated(BlockDriverState *bs, int64_t 
sector_num,
 
         num_checked = MIN(nb_sectors, INT_MAX);
         ret = bdrv_is_allocated(bs, sector_num, num_checked, &num);
-        if (ret == firstret) {
+        if (ret == firstret && num) {
             *pnum += num;
         } else {
             break;
@@ -1927,6 +1927,9 @@ static int map_f(BlockDriverState *bs, int argc, char 
**argv)
         if (ret < 0) {
             error_report("Failed to get allocation status: %s", 
strerror(-ret));
             return 0;
+        } else if (!num) {
+            error_report("Unexpected end of image");
+            return 0;
         }
 
         retstr = ret ? "    allocated" : "not allocated";
-- 
1.9.3