getdelays.c: fix overrun

A patch for getdelays.c that fixes a buffer overrun when you set -w.

Cc: <matt@bluehost.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 4 deletions

diff --git a/Documentation/accounting/getdelays.c b/Documentation/accounting/getdelays.c
index 6207e2f59e3..71acc28ed0d 100644
--- a/Documentation/accounting/getdelays.c
+++ b/Documentation/accounting/getdelays.c
@@ -61,8 +61,6 @@ __u64 stime, utime;
 #define MAX_MSG_SIZE    1024
 /* Maximum number of cpus expected to be specified in a cpumask */
 #define MAX_CPUS        32
-/* Maximum length of pathname to log file */
-#define MAX_FILENAME    256
 
 struct msgtemplate {
         struct nlmsghdr n;
@@ -231,7 +229,7 @@ int main(int argc, char *argv[])
         int count = 0;
         int write_file = 0;
         int maskset = 0;
-        char logfile[128];
+        char *logfile = NULL;
         int loop = 0;
 
         struct msgtemplate msg;
@@ -251,7 +249,7 @@ int main(int argc, char *argv[])
                         print_io_accounting = 1;
                         break;
                 case 'w':
-                        strncpy(logfile, optarg, MAX_FILENAME);
+                        logfile = strdup(optarg);
                         printf("write to file %s\n", logfile);
                         write_file = 1;
                         break;