tools: hv: properly handle long paths

Paths can be up to PATH_MAX long and PATH_MAX is usually greater than 256.
While on it, simplify path reconstruction to a simple snprintf(), define
and reuse KVP_NET_DIR.

Suggested-by: Tomas Hozza <thozza@redhat.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 18 insertions, 26 deletions

diff --git a/tools/hv/hv_kvp_daemon.c b/tools/hv/hv_kvp_daemon.c
index f1758fcbc37d..88b20e007c05 100644
--- a/tools/hv/hv_kvp_daemon.c
+++ b/tools/hv/hv_kvp_daemon.c
@@ -39,6 +39,7 @@
 #include <fcntl.h>
 #include <dirent.h>
 #include <net/if.h>
+#include <limits.h>
 #include <getopt.h>
 
 /*
@@ -97,6 +98,8 @@ static struct utsname uts_buf;
 #define KVP_SCRIPTS_PATH "/usr/libexec/hypervkvpd/"
 #endif
 
+#define KVP_NET_DIR "/sys/class/net/"
+
 #define MAX_FILE_NAME 100
 #define ENTRIES_PER_BLOCK 50
 
@@ -596,26 +599,21 @@ static char *kvp_get_if_name(char *guid)
         DIR *dir;
         struct dirent *entry;
         FILE    *file;
-        char    *p, *q, *x;
+        char    *p, *x;
         char    *if_name = NULL;
         char    buf[256];
-        char *kvp_net_dir = "/sys/class/net/";
-        char dev_id[256];
+        char dev_id[PATH_MAX];
 
-        dir = opendir(kvp_net_dir);
+        dir = opendir(KVP_NET_DIR);
         if (dir == NULL)
                 return NULL;
 
-        snprintf(dev_id, sizeof(dev_id), "%s", kvp_net_dir);
-        q = dev_id + strlen(kvp_net_dir);
-
         while ((entry = readdir(dir)) != NULL) {
                 /*
                  * Set the state for the next pass.
                  */
-                *q = '\0';
-                strcat(dev_id, entry->d_name);
-                strcat(dev_id, "/device/device_id");
+                snprintf(dev_id, sizeof(dev_id), "%s%s/device/device_id",
+                         KVP_NET_DIR, entry->d_name);
 
                 file = fopen(dev_id, "r");
                 if (file == NULL)
@@ -653,12 +651,12 @@ static char *kvp_if_name_to_mac(char *if_name)
         FILE    *file;
         char    *p, *x;
         char    buf[256];
-        char addr_file[256];
+        char addr_file[PATH_MAX];
         unsigned int i;
         char *mac_addr = NULL;
 
-        snprintf(addr_file, sizeof(addr_file), "%s%s%s", "/sys/class/net/",
-                if_name, "/address");
+        snprintf(addr_file, sizeof(addr_file), "%s%s%s", KVP_NET_DIR,
+                 if_name, "/address");
 
         file = fopen(addr_file, "r");
         if (file == NULL)
@@ -688,28 +686,22 @@ static char *kvp_mac_to_if_name(char *mac)
         DIR *dir;
         struct dirent *entry;
         FILE    *file;
-        char    *p, *q, *x;
+        char    *p, *x;
         char    *if_name = NULL;
         char    buf[256];
-        char *kvp_net_dir = "/sys/class/net/";
-        char dev_id[256];
+        char dev_id[PATH_MAX];
         unsigned int i;
 
-        dir = opendir(kvp_net_dir);
+        dir = opendir(KVP_NET_DIR);
         if (dir == NULL)
                 return NULL;
 
-        snprintf(dev_id, sizeof(dev_id), "%s", kvp_net_dir);
-        q = dev_id + strlen(kvp_net_dir);
-
         while ((entry = readdir(dir)) != NULL) {
                 /*
                  * Set the state for the next pass.
                  */
-                *q = '\0';
-
-                strcat(dev_id, entry->d_name);
-                strcat(dev_id, "/address");
+                snprintf(dev_id, sizeof(dev_id), "%s%s/address", KVP_NET_DIR,
+                         entry->d_name);
 
                 file = fopen(dev_id, "r");
                 if (file == NULL)
@@ -1218,9 +1210,9 @@ static int process_ip_string(FILE *f, char *ip_string, int type)
 static int kvp_set_ip_info(char *if_name, struct hv_kvp_ipaddr_value *new_val)
 {
         int error = 0;
-        char if_file[128];
+        char if_file[PATH_MAX];
         FILE *file;
-        char cmd[512];
+        char cmd[PATH_MAX];
         char *mac_addr;
 
         /*