diff options
Diffstat (limited to 'block/qed.c')
| -rw-r--r-- | block/qed.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/block/qed.c b/block/qed.c index 2e06992784..d032a4574c 100644 --- a/block/qed.c +++ b/block/qed.c @@ -388,7 +388,6 @@ static int bdrv_qed_open(BlockDriverState *bs, int flags) if (ret < 0) { return ret; } - ret = 0; /* ret should always be 0 or -errno */ qed_header_le_to_cpu(&le_header, &s->header); if (s->header.magic != QED_MAGIC) { @@ -1420,8 +1419,10 @@ static int bdrv_qed_change_backing_file(BlockDriverState *bs, memcpy(buffer, &le_header, sizeof(le_header)); buffer_len = sizeof(le_header); - memcpy(buffer + buffer_len, backing_file, backing_file_len); - buffer_len += backing_file_len; + if (backing_file) { + memcpy(buffer + buffer_len, backing_file, backing_file_len); + buffer_len += backing_file_len; + } /* Write new header */ ret = bdrv_pwrite_sync(bs->file, 0, buffer, buffer_len); |