linux-kernel - [PATCH AUTOSEL 4.14 6/7] ata: libata-eh: Fix compilation warning in ata_eh_link

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Date:   Sat,  7 Oct 2023 20:50:52 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Damien Le Moal <dlemoal@...nel.org>,
        Hannes Reinecke <hare@...e.de>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        Sasha Levin <sashal@...nel.org>, linux-ide@...r.kernel.org
Subject: [PATCH AUTOSEL 4.14 6/7] ata: libata-eh: Fix compilation warning in ata_eh_link_report()

From: Damien Le Moal <dlemoal@...nel.org>

[ Upstream commit 49728bdc702391902a473b9393f1620eea32acb0 ]

The 6 bytes length of the tries_buf string in ata_eh_link_report() is
too short and results in a gcc compilation warning with W-!:

drivers/ata/libata-eh.c: In function ‘ata_eh_link_report’:
drivers/ata/libata-eh.c:2371:59: warning: ‘%d’ directive output may be truncated writing between 1 and 11 bytes into a region of size 4 [-Wformat-truncation=]
 2371 |                 snprintf(tries_buf, sizeof(tries_buf), " t%d",
      |                                                           ^~
drivers/ata/libata-eh.c:2371:56: note: directive argument in the range [-2147483648, 4]
 2371 |                 snprintf(tries_buf, sizeof(tries_buf), " t%d",
      |                                                        ^~~~~~
drivers/ata/libata-eh.c:2371:17: note: ‘snprintf’ output between 4 and 14 bytes into a destination of size 6
 2371 |                 snprintf(tries_buf, sizeof(tries_buf), " t%d",
      |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 2372 |                          ap->eh_tries);
      |                          ~~~~~~~~~~~~~

Avoid this warning by increasing the string size to 16B.

Signed-off-by: Damien Le Moal <dlemoal@...nel.org>
Reviewed-by: Hannes Reinecke <hare@...e.de>
Tested-by: Geert Uytterhoeven <geert+renesas@...der.be>
Reviewed-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/ata/libata-eh.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index cbe9af624a06f..bb47bbe20ef28 100644
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -2466,7 +2466,7 @@ static void ata_eh_link_report(struct ata_link *link)
 	struct ata_port *ap = link->ap;
 	struct ata_eh_context *ehc = &link->eh_context;
 	const char *frozen, *desc;
-	char tries_buf[6] = "";
+	char tries_buf[16] = "";
 	int tag, nr_failed = 0;
 
 	if (ehc->i.flags & ATA_EHI_QUIET)
-- 
2.40.1