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[Qemu-block] [PATCH 4/4] qcow2: Check failure of bdrv_getlength()
From: |
Eric Blake |
Subject: |
[Qemu-block] [PATCH 4/4] qcow2: Check failure of bdrv_getlength() |
Date: |
Mon, 7 Aug 2017 15:30:07 -0500 |
qcow2_co_pwritev_compressed() should not call bdrv_truncate()
if determining the size failed.
Reported-by: Markus Armbruster <address@hidden>
Signed-off-by: Eric Blake <address@hidden>
---
block/qcow2.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/block/qcow2.c b/block/qcow2.c
index 99407403ea..40ba26c111 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -3282,12 +3282,15 @@ qcow2_co_pwritev_compressed(BlockDriverState *bs,
uint64_t offset,
z_stream strm;
int ret, out_len;
uint8_t *buf, *out_buf;
- uint64_t cluster_offset;
+ int64_t cluster_offset;
if (bytes == 0) {
/* align end of file to a sector boundary to ease reading with
sector based I/Os */
cluster_offset = bdrv_getlength(bs->file->bs);
+ if (cluster_offset < 0) {
+ return cluster_offset;
+ }
return bdrv_truncate(bs->file, cluster_offset, PREALLOC_MODE_OFF,
NULL);
}
--
2.13.4
- [Qemu-block] [PATCH 2/4] qcow: Check failure of bdrv_getlength() and bdrv_truncate(), (continued)