From: Ferdinand Blomqvist <ferdinand.blomqvist@gmail.com>
To: linux-kernel@vger.kernel.org
Cc: Thomas Gleixner <tglx@linutronix.de>
Subject: [PATCH v2 5/7] rslib: Fix handling of of caller provided syndrome
Date: Thu, 20 Jun 2019 17:10:37 +0300 [thread overview]
Message-ID: <20190620141039.9874-6-ferdinand.blomqvist@gmail.com> (raw)
In-Reply-To: <20190620141039.9874-1-ferdinand.blomqvist@gmail.com>
Check if the syndrome provided by the caller is zero, and act
accordingly.
Signed-off-by: Ferdinand Blomqvist <ferdinand.blomqvist@gmail.com>
---
lib/reed_solomon/decode_rs.c | 14 ++++++++++++--
1 file changed, 12 insertions(+), 2 deletions(-)
diff --git a/lib/reed_solomon/decode_rs.c b/lib/reed_solomon/decode_rs.c
index 78629bbe6590..b7264a712d46 100644
--- a/lib/reed_solomon/decode_rs.c
+++ b/lib/reed_solomon/decode_rs.c
@@ -42,8 +42,18 @@
BUG_ON(pad < 0 || pad >= nn - nroots);
/* Does the caller provide the syndrome ? */
- if (s != NULL)
- goto decode;
+ if (s != NULL) {
+ for (i = 0; i < nroots; i++) {
+ /* The syndrome is in index form,
+ * so nn represents zero
+ */
+ if (s[i] != nn)
+ goto decode;
+ }
+
+ /* syndrome is zero, no errors to correct */
+ return 0;
+ }
/* form the syndromes; i.e., evaluate data(x) at roots of
* g(x) */
--
2.17.2
next prev parent reply other threads:[~2019-06-20 14:11 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-20 14:10 [PATCH v2 0/7] rslib: RS decoder is severely broken Ferdinand Blomqvist
2019-06-20 14:10 ` [PATCH v2 1/7] rslib: Add tests for the encoder and decoder Ferdinand Blomqvist
2019-06-26 13:01 ` [tip:core/rslib] " tip-bot for Ferdinand Blomqvist
2019-07-09 18:06 ` [PATCH v2 1/7] " Geert Uytterhoeven
2019-07-09 18:27 ` Thomas Gleixner
2019-06-20 14:10 ` [PATCH v2 2/7] rslib: Fix decoding of shortened codes Ferdinand Blomqvist
2019-06-26 13:01 ` [tip:core/rslib] " tip-bot for Ferdinand Blomqvist
2019-06-20 14:10 ` [PATCH v2 3/7] rslib: decode_rs: Fix length parameter check Ferdinand Blomqvist
2019-06-26 13:02 ` [tip:core/rslib] " tip-bot for Ferdinand Blomqvist
2019-06-20 14:10 ` [PATCH v2 4/7] rslib: decode_rs: code cleanup Ferdinand Blomqvist
2019-06-26 13:03 ` [tip:core/rslib] rslib: decode_rs: Code cleanup tip-bot for Ferdinand Blomqvist
2019-06-20 14:10 ` Ferdinand Blomqvist [this message]
2019-06-26 13:04 ` [tip:core/rslib] rslib: Fix handling of of caller provided syndrome tip-bot for Ferdinand Blomqvist
2019-06-20 14:10 ` [PATCH v2 6/7] rslib: Update documentation Ferdinand Blomqvist
2019-06-26 13:04 ` [tip:core/rslib] " tip-bot for Ferdinand Blomqvist
2019-06-20 14:10 ` [PATCH v2 7/7] rslib: Fix remaining decoder flaws Ferdinand Blomqvist
2019-06-26 13:05 ` [tip:core/rslib] " tip-bot for Ferdinand Blomqvist
2019-06-26 12:57 ` [PATCH v2 0/7] rslib: RS decoder is severely broken Thomas Gleixner
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