[Qemu-devel] Re: [PATCH] Replace strcmp() by strncmp()

[Jan Kiszka <jan.kiszka@siemens.com>]

Pavel Vasilyev wrote:
> Possible SIGSEGV 

I would suggest studying some strncmp implementation and also thinking
about the case that 'device' is, say, "nics"...

Jan

> 
> Index: net.c
> ===================================================================
> --- net.c       (revision 6463)
> +++ net.c       (working copy)
> @@ -1568,7 +1586,7 @@
>      if (get_param_value(buf, sizeof(buf), "name", p)) {
>          name = strdup(buf);
>      }
> -    if (!strcmp(device, "nic")) {
> +    if (!strncmp(device, "nic", 3)) {
>          NICInfo *nd;
>          uint8_t *macaddr;
> 
> @@ -1601,13 +1630,13 @@
>          vlan->nb_guest_devs++;
>          ret = 0;
>      } else
> -    if (!strcmp(device, "none")) {
> +    if (!strncmp(device, "none", 4)) {
>          /* does nothing. It is needed to signal that no network cards
>             are wanted */
>          ret = 0;
>      } else
>  #ifdef CONFIG_SLIRP
> -    if (!strcmp(device, "user")) {
> +    if (!strncmp(device, "user", 4)) {
>          if (get_param_value(buf, sizeof(buf), "hostname", p)) {
>              pstrcpy(slirp_hostname, sizeof(slirp_hostname), buf);
>          }
> @@ -1622,7 +1651,7 @@
>      } else
>  #endif
>  #ifdef _WIN32
> -    if (!strcmp(device, "tap")) {
> +    if (!strncmp(device, "tap", 3)) {
>          char ifname[64];
>          if (get_param_value(ifname, sizeof(ifname), "ifname", p) <= 0) {
>              fprintf(stderr, "tap: no interface name\n");
> @@ -1633,7 +1662,7 @@
>      } else
>  #elif defined (_AIX)
>  #else
> -    if (!strcmp(device, "tap")) {
> +    if (!strncmp(device, "tap", 3)) {
>          char ifname[64];
>          char setup_script[1024], down_script[1024];
>          int fd;
> 
> 

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