tree a645b25b33767bb91c071049cc82a20924e125b1
parent df5b05868d66a58d184e2ce8b87abe86918a5fd8
author Ferdinand Blomqvist <ferdinand.blomqvist@gmail.com> 1561039834 +0300
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1564904002 +0200

rslib: Fix decoding of shortened codes

[ Upstream commit 2034a42d1747fc1e1eeef2c6f1789c4d0762cb9c ]

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
Signed-off-by: Sasha Levin <sashal@kernel.org>