linux-kernel - [PATCH] scsi: eata: drop VLA in reorder()

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Date:   Sun, 11 Mar 2018 22:06:58 +0100
From:   Salvatore Mesoraca <s.mesoraca16@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     kernel-hardening@...ts.openwall.com, linux-scsi@...r.kernel.org,
        "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Dario Ballabio <ballabio_dario@....com>,
        Kees Cook <keescook@...omium.org>,
        Salvatore Mesoraca <s.mesoraca16@...il.com>
Subject: [PATCH] scsi: eata: drop VLA in reorder()

n_ready will always be less than or equal to MAX_MAILBOXES.
So we avoid a VLA[1] and use fixed-length arrays instead.

[1] https://lkml.org/lkml/2018/3/7/621

Signed-off-by: Salvatore Mesoraca <s.mesoraca16@...il.com>
---
 drivers/scsi/eata.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/eata.c b/drivers/scsi/eata.c
index 6501c33..202cd17 100644
--- a/drivers/scsi/eata.c
+++ b/drivers/scsi/eata.c
@@ -2096,7 +2096,7 @@ static int reorder(struct hostdata *ha, unsigned long cursec,
 	unsigned int k, n;
 	unsigned int rev = 0, s = 1, r = 1;
 	unsigned int input_only = 1, overlap = 0;
-	unsigned long sl[n_ready], pl[n_ready], ll[n_ready];
+	unsigned long sl[MAX_MAILBOXES], pl[MAX_MAILBOXES], ll[MAX_MAILBOXES];
 	unsigned long maxsec = 0, minsec = ULONG_MAX, seek = 0, iseek = 0;
 	unsigned long ioseek = 0;
 
-- 
1.9.1