Messages in this thread Patch in this message | | | From | Ferdinand Blomqvist <> | Subject | [RFC PATCH 5/7] rslib: Fix handling of of caller provided syndrome | Date | Sat, 30 Mar 2019 20:29:45 +0200 |
| |
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 | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/lib/reed_solomon/decode_rs.c b/lib/reed_solomon/decode_rs.c index 78629bbe6590..7ecc449e57e9 100644 --- a/lib/reed_solomon/decode_rs.c +++ b/lib/reed_solomon/decode_rs.c @@ -42,8 +42,16 @@ 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
| |