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Date: Thu, 20 Jun 2019 17:10:37 +0300
From: Ferdinand Blomqvist <ferdinand.blomqvist@...il.com>
To: linux-kernel@...r.kernel.org
Cc: Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH v2 5/7] rslib: Fix handling of of caller provided syndrome
Check if the syndrome provided by the caller is zero, and act
accordingly.
Signed-off-by: Ferdinand Blomqvist <ferdinand.blomqvist@...il.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
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