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[Qemu-block] [PATCH v1 04/15] qcow: require image size to be > 1 for new


From: Daniel P. Berrange
Subject: [Qemu-block] [PATCH v1 04/15] qcow: require image size to be > 1 for new images
Date: Tue, 3 Jan 2017 18:27:50 +0000

The qcow driver refuses to open images which are less than
2 bytes in size, but will happily create such images. Add
a check in the create path to avoid this discrepancy.

Signed-off-by: Daniel P. Berrange <address@hidden>
---
 block/qcow.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/block/qcow.c b/block/qcow.c
index 7540f43..8133fda 100644
--- a/block/qcow.c
+++ b/block/qcow.c
@@ -799,6 +799,12 @@ static int qcow_create(const char *filename, QemuOpts 
*opts, Error **errp)
     /* Read out options */
     total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
                           BDRV_SECTOR_SIZE);
+    if (total_size <= 1) {
+        error_setg(errp, "Image size is too small (must be at least 2 bytes)");
+        ret = -EINVAL;
+        goto cleanup;
+    }
+
     backing_file = qemu_opt_get_del(opts, BLOCK_OPT_BACKING_FILE);
     if (qemu_opt_get_bool_del(opts, BLOCK_OPT_ENCRYPT, false)) {
         flags |= BLOCK_FLAG_ENCRYPT;
-- 
2.9.3




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