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[Qemu-block] [PATCH v2 for-2.10 2/4] block/vhdx: check for offset overfl
From: |
Jeff Cody |
Subject: |
[Qemu-block] [PATCH v2 for-2.10 2/4] block/vhdx: check for offset overflow to bdrv_truncate() |
Date: |
Mon, 7 Aug 2017 08:38:20 -0400 |
VHDX uses uint64_t types for most offsets, following the VHDX spec.
However, bdrv_truncate() takes an int64_t value for the truncating
offset. Check for overflow before calling bdrv_truncate().
While we are here, replace the bit shifting with QEMU_ALIGN_UP as well.
N.B.: For a compliant image this is not an issue, as the maximum VHDX
image size is defined per the spec to be 64TB.
Reviewed-by: Eric Blake <address@hidden>
Reviewed-by: Kevin Wolf <address@hidden>
Signed-off-by: Jeff Cody <address@hidden>
---
block/vhdx-log.c | 6 +++++-
block/vhdx.c | 3 +++
2 files changed, 8 insertions(+), 1 deletion(-)
diff --git a/block/vhdx-log.c b/block/vhdx-log.c
index 2e26fd4..9597223 100644
--- a/block/vhdx-log.c
+++ b/block/vhdx-log.c
@@ -553,7 +553,11 @@ static int vhdx_log_flush(BlockDriverState *bs,
BDRVVHDXState *s,
new_file_size = desc_entries->hdr.last_file_offset;
if (new_file_size % (1024*1024)) {
/* round up to nearest 1MB boundary */
- new_file_size = ((new_file_size >> 20) + 1) << 20;
+ new_file_size = QEMU_ALIGN_UP(new_file_size, MiB);
+ if (new_file_size > INT64_MAX) {
+ ret = -EINVAL;
+ goto exit;
+ }
bdrv_truncate(bs->file, new_file_size, PREALLOC_MODE_OFF,
NULL);
}
}
diff --git a/block/vhdx.c b/block/vhdx.c
index 37224b8..7ae4589 100644
--- a/block/vhdx.c
+++ b/block/vhdx.c
@@ -1177,6 +1177,9 @@ static int vhdx_allocate_block(BlockDriverState *bs,
BDRVVHDXState *s,
/* per the spec, the address for a block is in units of 1MB */
*new_offset = ROUND_UP(*new_offset, 1024 * 1024);
+ if (*new_offset > INT64_MAX) {
+ return -EINVAL;
+ }
return bdrv_truncate(bs->file, *new_offset + s->block_size,
PREALLOC_MODE_OFF, NULL);
--
2.9.4