Messages in this thread | | | Date | Fri, 24 Jun 2022 20:47:57 -0300 | From | Jason Gunthorpe <> | Subject | Re: [RFC PATCH] RDMA/srp: Fix use-after-free in srp_exit_cmd_priv |
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On Fri, Jun 24, 2022 at 04:26:06PM -0700, Bart Van Assche wrote: > On 6/24/22 15:59, Jason Gunthorpe wrote: > > I don't even understand how get_device() prevents this call chain?? > > > > It looks to me like the problem is srp_remove_one() is not waiting for > > or canceling some outstanding work. > > Hi Jason, > > My conclusions from the call traces in Li's email are as follows: > * scsi_host_dev_release() can get called after srp_remove_one(). > * srp_exit_cmd_priv() uses the ib_device pointer. If srp_remove_one() is > called before srp_exit_cmd_priv() then a use-after-free is triggered.
Shouldn't srp_remove_one() wait for the scsi_host_dev to complete destruction? Clearly it cannot continue to exist once the IB device has been removed
> Is calling get_device() and put_device() on the struct ib_device an > acceptable way to fix this?
As I said, I don't understand at all how this works. get_device() does not prevent srp_remove_one() from being called.
Jason
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