[PATCH v3 2/4] qemu-img: validate image length in img_map

[Eyal Moscovici <eyal.moscovici@oracle.com>]

The code handles this case correctly we merely skip the loop. However it
is probably best to return an explicit error.

Reviewed-by: Eric Blake <eblake@redhat.com>
Acked-by: Mark Kanda <mark.kanda@oracle.com>
Signed-off-by: Eyal Moscovici <eyal.moscovici@oracle.com>
---
 qemu-img.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/qemu-img.c b/qemu-img.c
index cc2e4a3799..23e90a99e1 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -3091,6 +3091,11 @@ static int img_map(int argc, char **argv)
     }
 
     length = blk_getlength(blk);
+    if (length < 0) {
+        error_report("Failed to get size for '%s'", filename);
+        return 1;
+    }
+
     while (curr.start + curr.length < length) {
         int64_t offset = curr.start + curr.length;
         int64_t n;
-- 
2.17.2 (Apple Git-113)