blkverify: Catch bs->exact_filename overflow

[mirror_qemu.git] / block / blkverify.c

diff --git a/block/blkverify.c b/block/blkverify.c
index 6b0a603cf0fe5b1b1ef50ba79b52a480d32ff23f..06369f9eac43791479a9c2c54d102236628c5cb9 100644 (file)
--- a/block/blkverify.c
+++ b/block/blkverify.c
@@ -301,10 +301,14 @@ static void blkverify_refresh_filename(BlockDriverState *bs, QDict *options)
     if (bs->file->bs->exact_filename[0]
         && s->test_file->bs->exact_filename[0])
     {
-        snprintf(bs->exact_filename, sizeof(bs->exact_filename),
-                 "blkverify:%s:%s",
-                 bs->file->bs->exact_filename,
-                 s->test_file->bs->exact_filename);
+        int ret = snprintf(bs->exact_filename, sizeof(bs->exact_filename),
+                           "blkverify:%s:%s",
+                           bs->file->bs->exact_filename,
+                           s->test_file->bs->exact_filename);
+        if (ret >= sizeof(bs->exact_filename)) {
+            /* An overflow makes the filename unusable, so do not report any */
+            bs->exact_filename[0] = 0;
+        }
     }
 }