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Re: [PATCH v6 1/6] qcow2: Fix dangling pointer after reopen for 'file'


From: Vladimir Sementsov-Ogievskiy
Subject: Re: [PATCH v6 1/6] qcow2: Fix dangling pointer after reopen for 'file'
Date: Thu, 8 Jul 2021 16:52:06 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0

08.07.2021 14:47, Kevin Wolf wrote:
Without an external data file, s->data_file is a second pointer with the
same value as bs->file. When changing bs->file to a different BdrvChild
and freeing the old BdrvChild, s->data_file must also be updated,
otherwise it points to freed memory and causes crashes.

This problem was caught by iotests case 245.

Fixes: df2b7086f169239ebad5d150efa29c9bb6d4f820
Signed-off-by: Kevin Wolf<kwolf@redhat.com>

Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>

--
Best regards,
Vladimir



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