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SubjectRe: [PATCH] Documentation: Fix NUL termination of strncpy
Ensure the copied strings are NUL terminated.

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
---
>> Rationale (please correct me if I'm wrong):

I was confused. strncpy requires explicit NUL termination
or it depends on a NUL in the source string.

Documentation/accounting/getdelays.c | 3 ++-
Documentation/hwmon/hpfall.c | 3 ++-
Documentation/networking/radiotap-headers.txt | 2 +-
.../networking/timestamping/timestamping.c | 6 ++++--
4 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/Documentation/accounting/getdelays.c b/Documentation/accounting/getdelays.c
index 6e25c26..ba54b19 100644
--- a/Documentation/accounting/getdelays.c
+++ b/Documentation/accounting/getdelays.c
@@ -303,7 +303,8 @@ int main(int argc, char *argv[])
err(1, "Invalid rcv buf size\n");
break;
case 'm':
- strncpy(cpumask, optarg, sizeof(cpumask));
+ strncpy(cpumask, optarg, sizeof(cpumask) - 1);
+ cpumask[sizeof(cpumask) - 1] = '\0';
maskset = 1;
printf("cpumask %s maskset %d\n", cpumask, maskset);
break;
diff --git a/Documentation/hwmon/hpfall.c b/Documentation/hwmon/hpfall.c
index 681ec22..4a06c06 100644
--- a/Documentation/hwmon/hpfall.c
+++ b/Documentation/hwmon/hpfall.c
@@ -27,7 +27,8 @@ int set_unload_heads_path(char *device)

if (strlen(device) <= 5 || strncmp(device, "/dev/", 5) != 0)
return -EINVAL;
- strncpy(devname, device + 5, sizeof(devname));
+ strncpy(devname, device + 5, sizeof(devname) - 1);
+ devname[sizeof(devname) - 1] = '\0';

snprintf(unload_heads_path, sizeof(unload_heads_path),
"/sys/block/%s/device/unload_heads", devname);
diff --git a/Documentation/networking/radiotap-headers.txt b/Documentation/networking/radiotap-headers.txt
index 953331c..447e004 100644
--- a/Documentation/networking/radiotap-headers.txt
+++ b/Documentation/networking/radiotap-headers.txt
@@ -126,7 +126,7 @@ int MyFunction(u8 * buf, int buflen)

case IEEE80211_RADIOTAP_ANTENNA:
/* radiotap uses 0 for 1st ant */
- antenna = *iterator.this_arg);
+ antenna = *iterator.this_arg;
break;

case IEEE80211_RADIOTAP_DBM_TX_POWER:
diff --git a/Documentation/networking/timestamping/timestamping.c b/Documentation/networking/timestamping/timestamping.c
index a7936fe..e2a17a4 100644
--- a/Documentation/networking/timestamping/timestamping.c
+++ b/Documentation/networking/timestamping/timestamping.c
@@ -374,12 +374,14 @@ int main(int argc, char **argv)
bail("socket");

memset(&device, 0, sizeof(device));
- strncpy(device.ifr_name, interface, sizeof(device.ifr_name));
+ strncpy(device.ifr_name, interface, sizeof(device.ifr_name) - 1);
+ device.ifr_name[sizeof(device.ifr_name) - 1] = '\0';
if (ioctl(sock, SIOCGIFADDR, &device) < 0)
bail("getting interface IP address");

memset(&hwtstamp, 0, sizeof(hwtstamp));
- strncpy(hwtstamp.ifr_name, interface, sizeof(hwtstamp.ifr_name));
+ strncpy(hwtstamp.ifr_name, interface, sizeof(hwtstamp.ifr_name) - 1);
+ hwtstamp.ifr_name[sizeof(hwtstamp.ifr_name) - 1] = '\0';
hwtstamp.ifr_data = (void *)&hwconfig;
memset(&hwconfig, 0, sizeof(hwconfig));
hwconfig.tx_type =

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