nvme: avoid double free special payload

jira VULN-44150
cve CVE-2024-41073
commit-author Chunguang Xu <chunguang.xu@shopee.com>
commit e5d574a

If a discard request needs to be retried, and that retry may fail before
a new special payload is added, a double free will result. Clear the
RQF_SPECIAL_LOAD when the request is cleaned.

	Signed-off-by: Chunguang Xu <chunguang.xu@shopee.com>
	Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
	Reviewed-by: Max Gurtovoy <mgurtovoy@nvidia.com>
	Signed-off-by: Keith Busch <kbusch@kernel.org>
(cherry picked from commit e5d574a)
	Signed-off-by: CIQ Kernel Automation <ciq_kernel_automation@ciq.com>

Author: CIQ Kernel Automation

drivers/nvme/host/core.c

@@ -959,6 +959,7 @@ void nvme_cleanup_cmd(struct request *req)
 			clear_bit_unlock(0, &ctrl->discard_page_busy);
 		else
 			kfree(bvec_virt(&req->special_vec));
+		req->rq_flags &= ~RQF_SPECIAL_PAYLOAD;
 	}
 }
 EXPORT_SYMBOL_GPL(nvme_cleanup_cmd);