sunrpc: handle SVC_GARBAGE during svc auth processing as auth error

jira VULN-71607
cve CVE-2025-38089
commit-author Jeff Layton <jlayton@kernel.org>
commit 94d10a4
upstream-diff A merge conflict was caused because the following
    commit doesn't exit in our tree:
    ab42f4d ("sunrpc: don't change ->sv_stats if it doesn't exist")

tianshuo han reported a remotely-triggerable crash if the client sends a
kernel RPC server a specially crafted packet. If decoding the RPC reply
fails in such a way that SVC_GARBAGE is returned without setting the
rq_accept_statp pointer, then that pointer can be dereferenced and a
value stored there.

If it's the first time the thread has processed an RPC, then that
pointer will be set to NULL and the kernel will crash. In other cases,
it could create a memory scribble.

The server sunrpc code treats a SVC_GARBAGE return from svc_authenticate
or pg_authenticate as if it should send a GARBAGE_ARGS reply. RFC 5531
says that if authentication fails that the RPC should be rejected
instead with a status of AUTH_ERR.

Handle a SVC_GARBAGE return as an AUTH_ERROR, with a reason of
AUTH_BADCRED instead of returning GARBAGE_ARGS in that case. This
sidesteps the whole problem of touching the rpc_accept_statp pointer in
this situation and avoids the crash.

	Cc: stable@kernel.org
Fixes: 29cd292 ("SUNRPC: Fix encoding of accepted but unsuccessful RPC replies")
	Reported-by: tianshuo han <hantianshuo233@gmail.com>
	Reviewed-by: Chuck Lever <chuck.lever@oracle.com>
	Signed-off-by: Jeff Layton <jlayton@kernel.org>
	Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
(cherry picked from commit 94d10a4)
	Signed-off-by: Shreeya Patel <spatel@ciq.com>
Signed-off-by: Shreeya Patel <spatel@ciq.com>

Author: shreeya-patel98

net/sunrpc/svc.c

@@ -1343,7 +1343,8 @@ svc_process_common(struct svc_rqst *rqstp)
 	case SVC_OK:
 		break;
 	case SVC_GARBAGE:
-		goto err_garbage_args;
+		rqstp->rq_auth_stat = rpc_autherr_badcred;
+		goto err_bad_auth;
 	case SVC_SYSERR:
 		goto err_system_err;
 	case SVC_DENIED:
@@ -1478,13 +1479,6 @@ svc_process_common(struct svc_rqst *rqstp)
 	*rqstp->rq_accept_statp = rpc_proc_unavail;
 	goto sendit;
 
-err_garbage_args:
-	svc_printk(rqstp, "failed to decode RPC header\n");
-
-	serv->sv_stats->rpcbadfmt++;
-	*rqstp->rq_accept_statp = rpc_garbage_args;
-	goto sendit;
-
 err_system_err:
 	serv->sv_stats->rpcbadfmt++;
 	*rqstp->rq_accept_statp = rpc_system_err;