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From 5cefc50d497d347c2352d785657b04db99e06ec8 Mon Sep 17 00:00:00 2001
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From: Max Reitz <mreitz@redhat.com>
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Date: Sat, 13 Jun 2015 16:22:07 +0200
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Subject: [PATCH 13/42] qcow2: Do not overflow when writing an L1 sector
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Message-id: <1434212556-3927-14-git-send-email-mreitz@redhat.com>
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Patchwork-id: 66032
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O-Subject: [RHEL-7.2 qemu-kvm PATCH 13/42] qcow2: Do not overflow when writing an L1 sector
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Bugzilla: 1129893
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RH-Acked-by: Jeffrey Cody <jcody@redhat.com>
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RH-Acked-by: Fam Zheng <famz@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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BZ: 1129893
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While writing an L1 table sector, qcow2_write_l1_entry() copies the
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respective range from s->l1_table to the local "buf" array. The size of
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s->l1_table does not have to be a multiple of L1_ENTRIES_PER_SECTOR;
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thus, limit the index which is used for copying all entries to the L1
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size.
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Cc: qemu-stable@nongnu.org
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Signed-off-by: Max Reitz <mreitz@redhat.com>
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Reviewed-by: Peter Lieven <pl@kamp.de>
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Reviewed-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 a1391444fe1cfef14976458f3293a2c6945e725c)
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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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block/qcow2-cluster.c | 6 ++++--
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1 file changed, 4 insertions(+), 2 deletions(-)
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diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c
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index 0e3b8d7..053e9fe 100644
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--- a/block/qcow2-cluster.c
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+++ b/block/qcow2-cluster.c
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@@ -151,12 +151,14 @@ static int l2_load(BlockDriverState *bs, uint64_t l2_offset,
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int qcow2_write_l1_entry(BlockDriverState *bs, int l1_index)
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{
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BDRVQcowState *s = bs->opaque;
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- uint64_t buf[L1_ENTRIES_PER_SECTOR];
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+ uint64_t buf[L1_ENTRIES_PER_SECTOR] = { 0 };
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int l1_start_index;
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int i, ret;
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l1_start_index = l1_index & ~(L1_ENTRIES_PER_SECTOR - 1);
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- for (i = 0; i < L1_ENTRIES_PER_SECTOR; i++) {
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+ for (i = 0; i < L1_ENTRIES_PER_SECTOR && l1_start_index + i < s->l1_size;
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+ i++)
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+ {
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buf[i] = cpu_to_be64(s->l1_table[l1_start_index + i]);
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}
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--
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1.8.3.1
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