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From 46ead2c391924b68741d6da28f28f909b80f5914 Mon Sep 17 00:00:00 2001
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From: Kevin Wolf <kwolf@redhat.com>
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Date: Thu, 12 Jan 2023 20:14:51 +0100
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Subject: [PATCH 01/20] qcow2: Fix theoretical corruption in store_bitmap()
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error path
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Kevin Wolf <kwolf@redhat.com>
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RH-MergeRequest: 143: qemu-img: Fix exit code for errors closing the image
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RH-Bugzilla: 2150180
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RH-Acked-by: Thomas Huth <thuth@redhat.com>
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RH-Acked-by: Hanna Czenczek <hreitz@redhat.com>
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RH-Acked-by: Stefano Garzarella <sgarzare@redhat.com>
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RH-Commit: [1/4] a6a497947179431567d330d0501247a3749fb9fd (kmwolf/centos-qemu-kvm)
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In order to write the bitmap table to the image file, it is converted to
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big endian. If the write fails, it is passed to clear_bitmap_table() to
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free all of the clusters it had allocated before. However, if we don't
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convert it back to native endianness first, we'll free things at a wrong
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offset.
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In practical terms, the offsets will be so high that we won't actually
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free any allocated clusters, but just run into an error, but in theory
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this can cause image corruption.
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Cc: qemu-stable@nongnu.org
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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Message-Id: <20230112191454.169353-2-kwolf@redhat.com>
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Reviewed-by: Hanna Czenczek <hreitz@redhat.com>
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Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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(cherry picked from commit b03dd9613bcf8fe948581b2b3585510cb525c382)
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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---
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block/qcow2-bitmap.c | 5 +++--
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1 file changed, 3 insertions(+), 2 deletions(-)
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diff --git a/block/qcow2-bitmap.c b/block/qcow2-bitmap.c
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index bcad567c0c..3dff99ba06 100644
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--- a/block/qcow2-bitmap.c
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+++ b/block/qcow2-bitmap.c
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@@ -115,7 +115,7 @@ static int update_header_sync(BlockDriverState *bs)
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return bdrv_flush(bs->file->bs);
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}
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-static inline void bitmap_table_to_be(uint64_t *bitmap_table, size_t size)
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+static inline void bitmap_table_bswap_be(uint64_t *bitmap_table, size_t size)
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{
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size_t i;
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@@ -1401,9 +1401,10 @@ static int store_bitmap(BlockDriverState *bs, Qcow2Bitmap *bm, Error **errp)
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goto fail;
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}
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- bitmap_table_to_be(tb, tb_size);
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+ bitmap_table_bswap_be(tb, tb_size);
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ret = bdrv_pwrite(bs->file, tb_offset, tb_size * sizeof(tb[0]), tb, 0);
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if (ret < 0) {
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+ bitmap_table_bswap_be(tb, tb_size);
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error_setg_errno(errp, -ret, "Failed to write bitmap '%s' to file",
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bm_name);
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goto fail;
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--
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2.31.1
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