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qcow2: Check failure of bdrv_getlength()

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qcow2_co_pwritev_compressed() should not call bdrv_truncate()
if determining the size failed.

Reported-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Jeff Cody <jcody@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Eric Blake
2017-08-11 13:23:47 +02:00
committed by Kevin Wolf
parent c40fe9c06c
commit d0d5d0e31a
1 changed files with 4 additions and 1 deletions
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block/qcow2.c
+4 -1
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@@ -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);
}