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From: Ferdinand Blomqvist <ferdinand.blomqvist@gmail.com>
To: linux-kernel@vger.kernel.org
Cc: Thomas Gleixner <tglx@linutronix.de>
Subject: [RFC PATCH 3/7] rslib: decode_rs: Fix length parameter check
Date: Sat, 30 Mar 2019 20:29:43 +0200	[thread overview]
Message-ID: <20190330182947.8823-4-ferdinand.blomqvist@gmail.com> (raw)
In-Reply-To: <20190330182947.8823-1-ferdinand.blomqvist@gmail.com>

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@gmail.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


  parent reply	other threads:[~2019-03-30 18:30 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-30 18:29 [RFC PATCH 0/7] rslib: RS decoder is severely broken Ferdinand Blomqvist
2019-03-30 18:29 ` [RFC PATCH 1/7] rslib: Add tests for the encoder and decoder Ferdinand Blomqvist
2019-06-17 20:44   ` Thomas Gleixner
2019-03-30 18:29 ` [RFC PATCH 2/7] rslib: Fix decoding of shortened codes Ferdinand Blomqvist
2019-06-17 20:46   ` Thomas Gleixner
2019-03-30 18:29 ` Ferdinand Blomqvist [this message]
2019-06-17 20:46   ` [RFC PATCH 3/7] rslib: decode_rs: Fix length parameter check Thomas Gleixner
2019-03-30 18:29 ` [RFC PATCH 4/7] rslib: decode_rs: code cleanup Ferdinand Blomqvist
2019-06-17 20:47   ` Thomas Gleixner
2019-03-30 18:29 ` [RFC PATCH 5/7] rslib: Fix handling of of caller provided syndrome Ferdinand Blomqvist
2019-06-17 20:49   ` Thomas Gleixner
2019-03-30 18:29 ` [RFC PATCH 6/7] rslib: Update documentation Ferdinand Blomqvist
2019-06-17 20:49   ` Thomas Gleixner
2019-03-30 18:29 ` [RFC PATCH 7/7] rslib: Fix remaining decoder flaws Ferdinand Blomqvist
2019-06-17 21:00   ` Thomas Gleixner
2019-06-20 12:09     ` Ferdinand Blomqvist
2019-04-04 11:24 ` [RFC PATCH 0/7] rslib: RS decoder is severely broken Thomas Gleixner
2019-05-09 15:09   ` Ferdinand Blomqvist
2019-05-24  7:25     ` Thomas Gleixner

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