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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>
Change-Id: Id77cebe23ff91023a24cfe091f5f62a76a9175fd
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/1921
Community-CI: Mellanox Build Bot
Community-CI: Broadcom CI
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
This commit is contained in:
Tomasz Zawadzki 2020-04-16 10:10:47 -04:00 committed by Jim Harris
parent 15a5018067
commit d9a11fd5b1
4 changed files with 23 additions and 4 deletions
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3
include/spdk/nvme.h
View File

@ -3044,8 +3044,9 @@ int spdk_nvme_cuse_register(struct spdk_nvme_ctrlr *ctrlr);
*
* \param ctrlr Opaque handle to the NVMe controller.
*
* \return 0 on success. Negated errno on failure.
*/
void spdk_nvme_cuse_unregister(struct spdk_nvme_ctrlr *ctrlr);
int spdk_nvme_cuse_unregister(struct spdk_nvme_ctrlr *ctrlr);
int spdk_nvme_map_prps(void *prv, struct spdk_nvme_cmd *cmd, struct iovec *iovs,
uint32_t len, size_t mps,

14
lib/nvme/nvme_cuse.c
View File

@ -942,12 +942,22 @@ spdk_nvme_cuse_register(struct spdk_nvme_ctrlr *ctrlr)
return rc;
}
void
int
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 -ENODEV;
}
cuse_nvme_ctrlr_stop(ctrlr_device);
nvme_io_msg_ctrlr_unregister(ctrlr, &cuse_nvme_io_msg_producer);
return 0;
}
char *

7
module/bdev/nvme/bdev_nvme_cuse_rpc.c
View File

@ -118,6 +118,7 @@ spdk_rpc_nvme_cuse_unregister(struct spdk_jsonrpc_request *request,
struct rpc_nvme_cuse_unregister req = {};
struct spdk_json_write_ctx *w;
struct nvme_bdev_ctrlr *bdev_ctrlr = NULL;
int rc;
if (spdk_json_decode_object(params, rpc_nvme_cuse_unregister_decoders,
SPDK_COUNTOF(rpc_nvme_cuse_unregister_decoders),
@ -135,7 +136,11 @@ spdk_rpc_nvme_cuse_unregister(struct spdk_jsonrpc_request *request,
goto cleanup;
}
spdk_nvme_cuse_unregister(bdev_ctrlr->ctrlr);
rc = spdk_nvme_cuse_unregister(bdev_ctrlr->ctrlr);
if (rc) {
spdk_jsonrpc_send_error_response(request, rc, spdk_strerror(-rc));
goto cleanup;
}
w = spdk_jsonrpc_begin_result(request);
spdk_json_write_bool(w, true);

3
test/nvme/cuse/nvme_cuse.sh
View File

@ -36,6 +36,9 @@ if [ -c "$ctrlr" ]; then
exit 1
fi
# Verify removing non-existent cuse device
$rpc_py bdev_nvme_cuse_unregister -n Nvme0 && false
$rpc_py bdev_nvme_cuse_register -n Nvme0
sleep 1