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vhdx: Handle failure for potentially large allocations

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Some code in the block layer makes potentially huge allocations. Failure
is not completely unexpected there, so avoid aborting qemu and handle
out-of-memory situations gracefully.

This patch addresses the allocations in the vhdx block driver.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Benoit Canet <benoit@irqsave.net>
This commit is contained in:
Kevin Wolf 2014-05-20 13:55:50 +02:00
parent 17cce73578
commit a67e128a4f
2 changed files with 17 additions and 3 deletions
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7
block/vhdx-log.c
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@ -352,7 +352,12 @@ static int vhdx_log_read_desc(BlockDriverState *bs, BDRVVHDXState *s,
}
desc_sectors = vhdx_compute_desc_sectors(hdr.descriptor_count);
desc_entries = qemu_blockalign(bs, desc_sectors * VHDX_LOG_SECTOR_SIZE);
desc_entries = qemu_try_blockalign(bs->file,
desc_sectors * VHDX_LOG_SECTOR_SIZE);
if (desc_entries == NULL) {
ret = -ENOMEM;
goto exit;
}
ret = vhdx_log_read_sectors(bs, log, &sectors_read, desc_entries,
desc_sectors, false);