nvmet-auth: assign dh_key to NULL after kfree_sensitive

ctrl->dh_key might be used across multiple calls to nvmet_setup_dhgroup()
for the same controller. So it's better to nullify it after release on
error path in order to avoid double free later in nvmet_destroy_auth().

Found by Linux Verification Center (linuxtesting.org) with Svace.

Fixes: 7a277c3 ("nvmet-auth: Diffie-Hellman key exchange support")
Cc: [email protected]
Signed-off-by: Vitaliy Shevtsov <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>
Reviewed-by: Hannes Reinecke <[email protected]>
Signed-off-by: Keith Busch <[email protected]>

Author: Vitaliy Shevtsov

drivers/nvme/target/auth.c

@@ -115,6 +115,7 @@ int nvmet_setup_dhgroup(struct nvmet_ctrl *ctrl, u8 dhgroup_id)
 			pr_debug("%s: ctrl %d failed to generate private key, err %d\n",
 				 __func__, ctrl->cntlid, ret);
 			kfree_sensitive(ctrl->dh_key);
+			ctrl->dh_key = NULL;
 			return ret;
 		}
 		ctrl->dh_keysize = crypto_kpp_maxsize(ctrl->dh_tfm);