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From bd6ce734563c0308b021c013f1e622ff185be60b Mon Sep 17 00:00:00 2001
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From: Max Reitz <mreitz@redhat.com>
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Date: Mon, 6 Aug 2018 16:35:52 +0200
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Subject: [PATCH 03/13] qemu-img: Fix assert when mapping unaligned raw file
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RH-Author: Max Reitz <mreitz@redhat.com>
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Message-id: <20180806163553.13344-2-mreitz@redhat.com>
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Patchwork-id: 81647
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O-Subject: [RHV-7.6 qemu-kvm-rhev PATCH 1/2] qemu-img: Fix assert when mapping unaligned raw file
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Bugzilla: 1601310
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RH-Acked-by: Eric Blake <eblake@redhat.com>
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RH-Acked-by: Kevin Wolf <kwolf@redhat.com>
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RH-Acked-by: John Snow <jsnow@redhat.com>
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From: Eric Blake <eblake@redhat.com>
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Commit a290f085 exposed a latent bug in qemu-img map introduced
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during the conversion of block status to be byte-based. Earlier in
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commit 5e344dd8, the internal interface get_block_status() switched
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to take byte-based parameters, but still called a sector-based
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block layer function; as such, rounding was added in the lone
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caller to obey the contract. However, commit 237d78f8 changed
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get_block_status() to truly be byte-based, at which point rounding
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to sector boundaries can result in calling bdrv_block_status() with
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'bytes == 0' (a coding error) when the boundary between data and a
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hole falls mid-sector (true for the past-EOF implicit hole present
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in POSIX files). Fix things by removing the rounding that is now
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no longer necessary.
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See also https://bugzilla.redhat.com/1589738
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Fixes: 237d78f8
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Reported-by: Dan Kenigsberg <danken@redhat.com>
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Reported-by: Nir Soffer <nsoffer@redhat.com>
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Reported-by: Maor Lipchuk <mlipchuk@redhat.com>
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CC: qemu-stable@nongnu.org
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Signed-off-by: Eric Blake <eblake@redhat.com>
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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(cherry picked from commit e0b371ed5e2db079051139136fd0478728b6a58f)
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Signed-off-by: Max Reitz <mreitz@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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qemu-img.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/qemu-img.c b/qemu-img.c
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index c9ccc1e..f42750a 100644
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--- a/qemu-img.c
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+++ b/qemu-img.c
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@@ -2925,7 +2925,7 @@ static int img_map(int argc, char **argv)
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int64_t n;
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/* Probe up to 1 GiB at a time. */
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- n = QEMU_ALIGN_DOWN(MIN(1 << 30, length - offset), BDRV_SECTOR_SIZE);
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+ n = MIN(1 << 30, length - offset);
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ret = get_block_status(bs, offset, n, &next;;
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if (ret < 0) {
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--
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1.8.3.1
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