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authorFerdinand Blomqvist <ferdinand.blomqvist@gmail.com>2019-06-20 17:10:34 +0300
committerThomas Gleixner <tglx@linutronix.de>2019-06-26 14:55:45 +0200
commit2034a42d1747fc1e1eeef2c6f1789c4d0762cb9c (patch)
treea0124f4c755eccdab837d6edbb758b2eed1b6ebe /lib/reed_solomon
parent4b4f3accd80304781c648b26ce4d53df082a4087 (diff)
rslib: Fix decoding of shortened codes
The decoding of shortenend codes is broken. It only works as expected if there are no erasures. When decoding with erasures, Lambda (the error and erasure locator polynomial) is initialized from the given erasure positions. The pad parameter is not accounted for by the initialisation code, and hence Lambda is initialized from incorrect erasure positions. The fix is to adjust the erasure positions by the supplied pad. Signed-off-by: Ferdinand Blomqvist <ferdinand.blomqvist@gmail.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lkml.kernel.org/r/20190620141039.9874-3-ferdinand.blomqvist@gmail.com
Diffstat (limited to 'lib/reed_solomon')
-rw-r--r--lib/reed_solomon/decode_rs.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/lib/reed_solomon/decode_rs.c b/lib/reed_solomon/decode_rs.c
index 1db74eb098d0..3313bf944ff1 100644
--- a/lib/reed_solomon/decode_rs.c
+++ b/lib/reed_solomon/decode_rs.c
@@ -99,9 +99,9 @@
if (no_eras > 0) {
/* Init lambda to be the erasure locator polynomial */
lambda[1] = alpha_to[rs_modnn(rs,
- prim * (nn - 1 - eras_pos[0]))];
+ prim * (nn - 1 - (eras_pos[0] + pad)))];
for (i = 1; i < no_eras; i++) {
- u = rs_modnn(rs, prim * (nn - 1 - eras_pos[i]));
+ u = rs_modnn(rs, prim * (nn - 1 - (eras_pos[i] + pad)));
for (j = i + 1; j > 0; j--) {
tmp = index_of[lambda[j - 1]];
if (tmp != nn) {