linux-kernel - [PATCH net] net: pktgen: Fix interface flags printing

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Date:   Mon, 16 Oct 2023 14:08:59 +0000
From:   Gavrilov Ilia <Ilia.Gavrilov@...otecs.ru>
To:     "David S. Miller" <davem@...emloft.net>
CC:     Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        "Jason A. Donenfeld" <Jason@...c4.com>,
        Kees Cook <keescook@...omium.org>,
        Yunsheng Lin <linyunsheng@...wei.com>,
        Dmitry Safonov <0x7f454c46@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "lvc-project@...uxtesting.org" <lvc-project@...uxtesting.org>
Subject: [PATCH net] net: pktgen: Fix interface flags printing

Device flags are displayed incorrectly:
1) The comparison (i == F_FLOW_SEQ) is always false, because F_FLOW_SEQ
is equal to (1 << FLOW_SEQ_SHIFT) == 2048, and the maximum value
of the 'i' variable is (NR_PKT_FLAG - 1) == 17. It should be compared
with FLOW_SEQ_SHIFT.

2) Similarly to the F_IPSEC flag.

3) Also add spaces to the print end of the string literal "spi:%u"
to prevent the output from merging with the flag that follows.

Found by InfoTeCS on behalf of Linux Verification Center
(linuxtesting.org) with SVACE.

Fixes: 99c6d3d20d62 ("pktgen: Remove brute-force printing of flags")
Signed-off-by: Gavrilov Ilia <Ilia.Gavrilov@...otecs.ru>
---
 net/core/pktgen.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/net/core/pktgen.c b/net/core/pktgen.c
index f56b8d697014..4d1696677c48 100644
--- a/net/core/pktgen.c
+++ b/net/core/pktgen.c
@@ -669,19 +669,19 @@ static int pktgen_if_show(struct seq_file *seq, void *v)
 	seq_puts(seq, "     Flags: ");
 
 	for (i = 0; i < NR_PKT_FLAGS; i++) {
-		if (i == F_FLOW_SEQ)
+		if (i == FLOW_SEQ_SHIFT)
 			if (!pkt_dev->cflows)
 				continue;
 
-		if (pkt_dev->flags & (1 << i))
+		if (pkt_dev->flags & (1 << i)) {
 			seq_printf(seq, "%s  ", pkt_flag_names[i]);
-		else if (i == F_FLOW_SEQ)
-			seq_puts(seq, "FLOW_RND  ");
-
 #ifdef CONFIG_XFRM
-		if (i == F_IPSEC && pkt_dev->spi)
-			seq_printf(seq, "spi:%u", pkt_dev->spi);
+			if (i == IPSEC_SHIFT && pkt_dev->spi)
+				seq_printf(seq, "spi:%u  ", pkt_dev->spi);
 #endif
+		} else if (i == FLOW_SEQ_SHIFT) {
+			seq_puts(seq, "FLOW_RND  ");
+		}
 	}
 
 	seq_puts(seq, "\n");
-- 
2.39.2