From: Sebastien GODARD <sysstat@users.noreply.github.com>
Date: Wed, 24 Nov 2021 17:33:08 +0000 (+0100)
Subject: mpstat: Fix untrusted loop bound
X-Git-Tag: v12.5.5~2
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=5d5a204006a3685e07e98ad92200b468c781bed9;p=sysstat

mpstat: Fix untrusted loop bound

Check that CPU value read from /proc/interrupts (or
/proc/softirqs) is within permissible range (CID#374284).

Signed-off-by: Sebastien GODARD <sysstat@users.noreply.github.com>
---

diff --git a/mpstat.c b/mpstat.c
index 727a7ea..f6bd297 100644
--- a/mpstat.c
+++ b/mpstat.c
@@ -1827,6 +1827,8 @@ void read_interrupts_stat(char *file, struct stats_irqcpu *st_ic[], int ic_nr, i
 			next = line;
 			while (((cp = strstr(next, "CPU")) != NULL) && (index < cpu_nr)) {
 				cpu = strtol(cp + 3, &next, 10);
+				if (cpu >= cpu_nr)
+					break;
 				cpu_index[index++] = cpu;
 
 				/*