File lparstat-Fix-array-overflow-issue.patch of Package powerpc-utils.27700

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File lparstat-Fix-array-overflow-issue.patch of Package powerpc-utils.27700

From b6bd4ddd0c0a24cce97c220ab0cadfd004dd58c4 Mon Sep 17 00:00:00 2001
From: Sathvika Vasireddy <sv@linux.ibm.com>
Date: Fri, 15 Jul 2022 14:35:13 +0530
Subject: [PATCH] lparstat: Fix array overflow issue

Upstream: accepted, expected in 1.3.11
Git-commit: b6bd4ddd0c0a24cce97c220ab0cadfd004dd58c4

lparstat is trying to read from out of bound file descriptors. Fix
this by making sure array overflow does not occur.

Without this patch:
===================================================================
ltcden8-lp7:/home/sathvika/powerpc-utils # lparstat -E 1 1
Failed to /sys/devices/system/cpu/cpu1162167776/spurr
===================================================================

With this patch:
===================================================================
ltcden8-lp7:/home/sathvika/powerpc-utils # ./src/lparstat -E 1 1

System Configuration
type=Dedicated mode=Capped smt=8 lcpu=6 mem=81341376 kB cpus=0 ent=6.00

---Actual---                 -Normalized-
%busy  %idle   Frequency     %busy  %idle
------ ------  ------------- ------ ------
  0.01  99.99  4.00GHz[116%]   0.02 115.98
====================================================================

Reported-by: Sachin Sant <sachinp@linux.ibm.com>
Signed-off-by: Sathvika Vasireddy <sv@linux.ibm.com>
Tested-by: Sachin Sant <sachinp@linux.ibm.com>
Signed-off-by: Tyrel Datwyler <tyreld@linux.ibm.com>
---
 src/lparstat.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/lparstat.c b/src/lparstat.c
index e998e8c..31a4ee8 100644
--- a/src/lparstat.c
+++ b/src/lparstat.c
@@ -180,7 +180,7 @@ int parse_sysfs_values(void)
 
 	spurr = idle_spurr = idle_purr = 0UL;
 
-	for (i = 0; cpu_sysfs_fds[i].spurr > 0; i++) {
+	for (i = 0; (i < threads_in_system) && (cpu_sysfs_fds[i].spurr >= 0); i++) {
 		rc = pread(cpu_sysfs_fds[i].spurr, (void *)line, sizeof(line), 0);
 		if (rc == -1) {
 			fprintf(stderr, "Failed to read /sys/devices/system/cpu/cpu%d/spurr\n",
-- 
2.39.0

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File lparstat-Fix-array-overflow-issue.patch of Package powerpc-utils.27700

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