diff options
| author | Ferdinand Blomqvist <ferdinand.blomqvist@gmail.com> | 2019-06-20 17:10:37 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-07-26 09:14:12 +0200 |
| commit | 0340c621eca84943c8a81b5c6e49cc88e0eedc38 (patch) | |
| tree | 19be52f5f48055e1476558641f204b3fb77f49ec /lib | |
| parent | 8ba93c59441a368749337318e78c8c1db07677b9 (diff) | |
| download | linux-stable-0340c621eca84943c8a81b5c6e49cc88e0eedc38.tar.gz linux-stable-0340c621eca84943c8a81b5c6e49cc88e0eedc38.tar.bz2 linux-stable-0340c621eca84943c8a81b5c6e49cc88e0eedc38.zip | |
rslib: Fix handling of of caller provided syndrome
[ Upstream commit ef4d6a8556b637ad27c8c2a2cff1dda3da38e9a9 ]
Check if the syndrome provided by the caller is zero, and act
accordingly.
Signed-off-by: Ferdinand Blomqvist <ferdinand.blomqvist@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20190620141039.9874-6-ferdinand.blomqvist@gmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/reed_solomon/decode_rs.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/lib/reed_solomon/decode_rs.c b/lib/reed_solomon/decode_rs.c index 3313bf944ff1..121beb2f0930 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); /* 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) */ |