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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Tejun Heo <tj@kernel.org>,
        Petru-Florin Mihancea <petrum@gmail.com>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.9 063/171] libata: fix error checking in in ata_parse_force_one()
Date:   Thu,  8 Nov 2018 13:50:33 -0800
Message-Id: <20181108215132.133863493@linuxfoundation.org>
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4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

[ Upstream commit f7cf69ae171592d133c69b9adaa5de7cfb6038ea ]

ata_parse_force_one() was incorrectly comparing @p to @endp when it
should have been comparing @id.  The only consequence is that it may
end up using an invalid port number in "libata.force" module param
instead of rejecting it.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Petru-Florin Mihancea <petrum@gmail.com>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=195785
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/ata/libata-core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 73d636d35961..a166359ad5d4 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -6781,7 +6781,7 @@ static int __init ata_parse_force_one(char **cur,
 	}
 
 	force_ent->port = simple_strtoul(id, &endp, 10);
-	if (p == endp || *endp != '\0') {
+	if (id == endp || *endp != '\0') {
 		*reason = "invalid port/link";
 		return -EINVAL;
 	}
-- 
2.17.1