Re: [syzbot] KASAN: use-after-free Read in nbd_genl_connect (2)
From: Christoph Hellwig <hch@lst.de>
Date: 2021-08-25 09:27:37
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On Wed, Aug 25, 2021 at 04:55:25PM +0800, Hillf Danton wrote:
Because no nbd is kfreed without being removed from the nbd idr, finding a freed nbd in the idr with nbd_index_mutex held means the nbd is not a valid pointer, and fix the uaf by cutting the chance for invalid nbd. Only for thoughts now.
That is a bug, but not really the problem here. I think the issue is the completion issue that Tetsuo reported. Looking into that at the moment.