From 2e31d1c3a5d729c4a9062e37210a1c01623327d6 Mon Sep 17 00:00:00 2001
From: Sami Kerola
Date: Sun, 3 Apr 2016 09:35:29 +0100
Subject: chrt: validate priority before trying to use it

Earlier message:

$ chrt -i 1 ls
chrt: failed to set pid 0's policy: Invalid argument

basically told 'something failed', while the new one tries to be more
helpful.

$ chrt -i 1 ls
chrt: unsupported priority value for the policy: 1: see --max for valid range

Addresses: https://bugs.debian.org/791707
Signed-off-by: Sami Kerola <kerolasa@iki.fi>
---
 schedutils/chrt.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/schedutils/chrt.c b/schedutils/chrt.c
index 64a58584f..202ce2526 100644
--- a/schedutils/chrt.c
+++ b/schedutils/chrt.c
@@ -504,7 +504,11 @@ int main(int argc, char **argv)
 #endif
 	if (ctl->pid == -1)
 		ctl->pid = 0;
-
+	if (ctl->priority < sched_get_priority_min(ctl->policy) ||
+	    sched_get_priority_max(ctl->policy) < ctl->priority)
+		errx(EXIT_FAILURE,
+		     _("unsupported priority value for the policy: %d: see --max for valid range"),
+		     ctl->priority);
 	set_sched(ctl);
 
 	if (ctl->verbose)
-- 
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