linux-kernel - [PATCH] turbostat: Check return value of fscanf

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Date:	Sat, 10 Aug 2013 17:37:39 -0700
From:	Josh Triplett <josh@...htriplett.org>
To:	linux-kernel@...r.kernel.org
Cc:	Len Brown <len.brown@...el.com>, akpm@...ux-foundation.org,
	torvalds@...ux-foundation.org
Subject: [PATCH] turbostat: Check return value of fscanf

Some systems declare fscanf with the warn_unused_result attribute.  On
such systems, turbostat generates the following warnings:

turbostat.c: In function 'get_core_id':
turbostat.c:1203:8: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result]
turbostat.c: In function 'get_physical_package_id':
turbostat.c:1186:8: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result]
turbostat.c: In function 'cpu_is_first_core_in_package':
turbostat.c:1169:8: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result]
turbostat.c: In function 'cpu_is_first_sibling_in_core':
turbostat.c:1148:8: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result]

Fix these by checking the return value of those four calls to fscanf.

Signed-off-by: Josh Triplett <josh@...htriplett.org>
---
 tools/power/x86/turbostat/turbostat.c | 20 ++++++++++++++++----
 1 file changed, 16 insertions(+), 4 deletions(-)

diff --git a/tools/power/x86/turbostat/turbostat.c b/tools/power/x86/turbostat/turbostat.c
index dc30f1b..514adba 100644
--- a/tools/power/x86/turbostat/turbostat.c
+++ b/tools/power/x86/turbostat/turbostat.c
@@ -1167,7 +1167,10 @@ int cpu_is_first_sibling_in_core(int cpu)
 		perror(path);
 		exit(1);
 	}
-	fscanf(filep, "%d", &first_cpu);
+	if (fscanf(filep, "%d", &first_cpu) != 1) {
+		perror(path);
+		exit(1);
+	}
 	fclose(filep);
 	return (cpu == first_cpu);
 }
@@ -1188,7 +1191,10 @@ int cpu_is_first_core_in_package(int cpu)
 		perror(path);
 		exit(1);
 	}
-	fscanf(filep, "%d", &first_cpu);
+	if (fscanf(filep, "%d", &first_cpu) != 1) {
+		perror(path);
+		exit(1);
+	}
 	fclose(filep);
 	return (cpu == first_cpu);
 }
@@ -1205,7 +1211,10 @@ int get_physical_package_id(int cpu)
 		perror(path);
 		exit(1);
 	}
-	fscanf(filep, "%d", &pkg);
+	if (fscanf(filep, "%d", &pkg) != 1) {
+		perror(path);
+		exit(1);
+	}
 	fclose(filep);
 	return pkg;
 }
@@ -1222,7 +1231,10 @@ int get_core_id(int cpu)
 		perror(path);
 		exit(1);
 	}
-	fscanf(filep, "%d", &core);
+	if (fscanf(filep, "%d", &core) != 1) {
+		perror(path);
+		exit(1);
+	}
 	fclose(filep);
 	return core;
 }
-- 
1.8.4.rc1

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/