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cuse: fix nvme_cuse unregister segfault

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Unregistering nvme_cuse when the device did not exist
resulted in SEGFAULT within nvme_io_msg_ctrlr_unregister().

To prevent that, when no nvme_cuse is registered for the
ctrlr do not unregister nvme_io_msg_producer.

RPC and spdk_nvme_cuse_unregister() now return an error.

Signed-off-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/1921 (master)

For backporting to 20.01.x, API breaking changes were removed.
Only part that could cause the segfault remained.

(cherry picked from commit d9a11fd5b1)
Change-Id: Id77cebe23ff91023a24cfe091f5f62a76a9175fd
Signed-off-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/2156
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
This commit is contained in:
Tomasz Zawadzki 2020-04-16 10:10:47 -04:00
parent d42b332ae6
commit cbb1d099ff
1 changed files with 9 additions and 1 deletions
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10
lib/nvme/nvme_cuse.c
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@ -951,7 +951,15 @@ spdk_nvme_cuse_register(struct spdk_nvme_ctrlr *ctrlr)
void
spdk_nvme_cuse_unregister(struct spdk_nvme_ctrlr *ctrlr)
{
nvme_cuse_stop(ctrlr);
struct cuse_device *ctrlr_device;
ctrlr_device = nvme_cuse_get_cuse_ctrlr_device(ctrlr);
if (!ctrlr_device) {
SPDK_ERRLOG("Cannot find associated CUSE device\n");
return;
}
cuse_nvme_ctrlr_stop(ctrlr_device);
nvme_io_msg_ctrlr_unregister(ctrlr, &cuse_nvme_io_msg_producer);
}