diff options
| author | Alberto Garcia <berto@igalia.com> | 2017-11-03 16:18:52 +0200 |
|---|---|---|
| committer | Max Reitz <mreitz@redhat.com> | 2017-11-14 18:06:25 +0100 |
| commit | 8aa34834d566ba4e635d6029339a5f4f1ae1685e (patch) | |
| tree | 8708d307c07eb4f467d34f6bd0378234b6850792 /tests/qemu-iotests/060 | |
| parent | 9883975050deffc147a3903d07ff995ecdc8a100 (diff) | |
qcow2: Prevent allocating compressed clusters at offset 0
If the refcount data is corrupted then we can end up trying to
allocate a new compressed cluster at offset 0 in the image, triggering
an assertion in qcow2_alloc_bytes() that would crash QEMU:
qcow2_alloc_bytes: Assertion `offset' failed.
This patch adds an explicit check for this scenario and a new test
case.
Signed-off-by: Alberto Garcia <berto@igalia.com>
Message-id: fb53467cf48e95ff3330def1cf1003a5b862b7d9.1509718618.git.berto@igalia.com
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
Diffstat (limited to 'tests/qemu-iotests/060')
| -rwxr-xr-x | tests/qemu-iotests/060 | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/tests/qemu-iotests/060 b/tests/qemu-iotests/060 index 40f85cc216..c3bce27b33 100755 --- a/tests/qemu-iotests/060 +++ b/tests/qemu-iotests/060 @@ -260,6 +260,16 @@ _make_test_img 64M poke_file "$TEST_IMG" "$rb_offset" "\x00\x00\x00\x00\x00\x00\x00\x00" $QEMU_IO -c "write 0 64k" "$TEST_IMG" | _filter_qemu_io +echo +echo "=== Testing empty refcount block with compressed write ===" +echo +_make_test_img 64M +$QEMU_IO -c "write 64k 64k" "$TEST_IMG" | _filter_qemu_io +poke_file "$TEST_IMG" "$rb_offset" "\x00\x00\x00\x00\x00\x00\x00\x00" +# The previous write already allocated an L2 table, so now this new +# write will try to allocate a compressed data cluster at offset 0. +$QEMU_IO -c "write -c 0k 64k" "$TEST_IMG" | _filter_qemu_io + # success, all done echo "*** done" rm -f $seq.full |