Commit ef4d6a85 authored Jun 20, 2019 by Ferdinand Blomqvist Committed by Thomas Gleixner Jun 26, 2019

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

parent 647cc9ec

lib/reed_solomon/decode_rs.c

+12 −2

Original line number	Diff line number	Diff line
		@@ -42,8 +42,18 @@
		BUG_ON(pad < 0 \|\| pad >= nn - nroots);

		/* Does the caller provide the syndrome ? */
		if (s != NULL)
		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) */

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