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| author | Ferdinand Blomqvist <ferdinand.blomqvist@gmail.com> | 2019-06-20 17:10:37 +0300 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2019-06-26 14:55:47 +0200 |
| commit | ef4d6a8556b637ad27c8c2a2cff1dda3da38e9a9 (patch) | |
| tree | 448b3b8cb09f14c3d3dca2069705e9b2def77c3b /lib/reed_solomon/decode_rs.c | |
| parent | 647cc9ece63fdba573a31bdafa54fb2d388c3c83 (diff) | |
| download | linux-ef4d6a8556b637ad27c8c2a2cff1dda3da38e9a9.tar.gz linux-ef4d6a8556b637ad27c8c2a2cff1dda3da38e9a9.tar.bz2 linux-ef4d6a8556b637ad27c8c2a2cff1dda3da38e9a9.zip | |
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@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20190620141039.9874-6-ferdinand.blomqvist@gmail.com
Diffstat (limited to 'lib/reed_solomon/decode_rs.c')
| -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 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) */ |