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dm: fix strncpy null-terminated issues

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Fix strncpy null-terminated issues.

Tracked-On: #3332
Signed-off-by: Tianhua Sun <tianhuax.s.sun@intel.com>
Acked-by: Anthony Xu <anthony.xu@intel.com>
This commit is contained in:
Tianhua Sun 2019-06-11 10:22:27 +08:00 committed by wenlingz
parent f4daf2d127
commit e7cfd9c561
1 changed files with 4 additions and 1 deletions
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5
devicemodel/hw/pci/virtio/virtio_net.c
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@ -642,8 +642,10 @@ virtio_net_tap_open(char *devname)
memset(&ifr, 0, sizeof(ifr)); memset(&ifr, 0, sizeof(ifr));
ifr.ifr_flags = IFF_TAP | IFF_NO_PI; ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
if (*devname) if (*devname) {
strncpy(ifr.ifr_name, devname, IFNAMSIZ); strncpy(ifr.ifr_name, devname, IFNAMSIZ);
ifr.ifr_name[IFNAMSIZ - 1] = '\0';
}
rc = ioctl(tunfd, TUNSETIFF, (void *)&ifr); rc = ioctl(tunfd, TUNSETIFF, (void *)&ifr);
if (rc < 0) { if (rc < 0) {
@ -654,6 +656,7 @@ virtio_net_tap_open(char *devname)
} }
strncpy(devname, ifr.ifr_name, IFNAMSIZ); strncpy(devname, ifr.ifr_name, IFNAMSIZ);
devname[IFNAMSIZ - 1] = '\0';
return tunfd; return tunfd;
} }