linux-kernel - [PATCH 5.10 133/289] SUNRPC: fix ternary sign expansion bug in tracing

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Date:   Mon, 17 May 2021 16:00:58 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>,
        Chuck Lever <chuck.lever@...cle.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.10 133/289] SUNRPC: fix ternary sign expansion bug in tracing

From: Dan Carpenter <dan.carpenter@...cle.com>

[ Upstream commit cb579086536f6564f5846f89808ec394ef8b8621 ]

This code is supposed to pass negative "err" values for tracing but it
passes positive values instead.  The problem is that the
trace_svcsock_tcp_send() function takes a long but "err" is an int and
"sent" is a u32.  The negative is first type promoted to u32 so it
becomes a high positive then it is promoted to long and it stays
positive.

Fix this by casting "err" directly to long.

Fixes: 998024dee197 ("SUNRPC: Add more svcsock tracepoints")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Chuck Lever <chuck.lever@...cle.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/sunrpc/svcsock.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/sunrpc/svcsock.c b/net/sunrpc/svcsock.c
index fa7b7ae2c2c5..eba1714bf09a 100644
--- a/net/sunrpc/svcsock.c
+++ b/net/sunrpc/svcsock.c
@@ -1176,7 +1176,7 @@ static int svc_tcp_sendto(struct svc_rqst *rqstp)
 		goto out_notconn;
 	err = svc_tcp_sendmsg(svsk->sk_sock, &msg, xdr, marker, &sent);
 	xdr_free_bvec(xdr);
-	trace_svcsock_tcp_send(xprt, err < 0 ? err : sent);
+	trace_svcsock_tcp_send(xprt, err < 0 ? (long)err : sent);
 	if (err < 0 || sent != (xdr->len + sizeof(marker)))
 		goto out_close;
 	mutex_unlock(&xprt->xpt_mutex);
-- 
2.30.2