block/io: fix bdrv_co_do_copy_on_readv
authorVladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Thu, 12 Mar 2020 08:19:49 +0000 (11:19 +0300)
committerStefan Hajnoczi <stefanha@redhat.com>
Mon, 16 Mar 2020 11:46:11 +0000 (11:46 +0000)
commit4ab78b19189a81038e744728ed949d09aa477550
tree0991e518dd75257fb71d4098e478b3a849fe62a3
parent61c265f0660ee476985808c8aa7915617c44fd53
block/io: fix bdrv_co_do_copy_on_readv

Prior to 1143ec5ebf4 it was OK to qemu_iovec_from_buf() from aligned-up
buffer to original qiov, as qemu_iovec_from_buf() will stop at qiov end
anyway.

But after 1143ec5ebf4 we assume that bdrv_co_do_copy_on_readv works on
part of original qiov, defined by qiov_offset and bytes. So we must not
touch qiov behind qiov_offset+bytes bound. Fix it.

Cc: qemu-stable@nongnu.org # v4.2
Fixes: 1143ec5ebf4
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Message-id: 20200312081949.5350-1-vsementsov@virtuozzo.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
block/io.c