linux-kernel - [RFC PATCH 3/7] rslib: decode_rs: Fix length parameter check

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Message-Id: <20190330182947.8823-4-ferdinand.blomqvist@gmail.com>
Date:   Sat, 30 Mar 2019 20:29:43 +0200
From:   Ferdinand Blomqvist <ferdinand.blomqvist@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     Thomas Gleixner <tglx@...utronix.de>
Subject: [RFC PATCH 3/7] rslib: decode_rs: Fix length parameter check

The length of the data load must be at least one. Or in other words,
there must be room for at least 1 data and nroots parity symbols after
shortening the RS code.

Signed-off-by: Ferdinand Blomqvist <ferdinand.blomqvist@...il.com>
---
 lib/reed_solomon/decode_rs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/reed_solomon/decode_rs.c b/lib/reed_solomon/decode_rs.c
index 3313bf944ff1..22006eaa41e6 100644
--- a/lib/reed_solomon/decode_rs.c
+++ b/lib/reed_solomon/decode_rs.c
@@ -39,7 +39,7 @@
 
 	/* Check length parameter for validity */
 	pad = nn - nroots - len;
-	BUG_ON(pad < 0 || pad >= nn);
+	BUG_ON(pad < 0 || pad >= nn - nroots);
 
 	/* Does the caller provide the syndrome ? */
 	if (s != NULL)
-- 
2.17.2