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    Subject[PATCH AUTOSEL 4.19 116/158] rslib: Fix handling of of caller provided syndrome
    Date
    From: Ferdinand Blomqvist <ferdinand.blomqvist@gmail.com>

    [ 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>
    ---
    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 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) */
    --
    2.20.1
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