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From 396ee697e4d5c7d10bacf6d4670fb4ddab357330 Mon Sep 17 00:00:00 2001
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From: Tomas Hozza <thozza@redhat.com>
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Date: Mon, 5 Nov 2012 13:56:02 +0100
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Subject: [PATCH] Tools: hv: Fix for long file names from readdir
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kvp_get_if_name and kvp_mac_to_if_name copy strings into statically
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sized buffers which could be too small to store really long names.
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Buffer sizes have been increased and length checks added via snprintf.
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---
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hv_kvp_daemon.c | 26 +++++++++-----------------
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1 file changed, 9 insertions(+), 17 deletions(-)
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diff --git a/hv_kvp_daemon.c b/hv_kvp_daemon.c
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index 3ea3af2..4c2ab6a 100755
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--- a/hv_kvp_daemon.c
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+++ b/hv_kvp_daemon.c
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@@ -44,6 +44,7 @@
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#include <fcntl.h>
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#include <dirent.h>
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#include <net/if.h>
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+#include <limits.h>
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/*
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* KVP protocol: The user mode component first registers with the
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@@ -588,26 +589,22 @@ static char *kvp_get_if_name(char *guid)
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DIR *dir;
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struct dirent *entry;
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FILE *file;
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- char *p, *q, *x;
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+ char *p, *x;
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char *if_name = NULL;
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char buf[256];
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char *kvp_net_dir = "/sys/class/net/";
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- char dev_id[256];
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+ char dev_id[PATH_MAX];
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dir = opendir(kvp_net_dir);
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if (dir == NULL)
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return NULL;
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- snprintf(dev_id, sizeof(dev_id), "%s", kvp_net_dir);
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- q = dev_id + strlen(kvp_net_dir);
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-
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while ((entry = readdir(dir)) != NULL) {
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/*
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* Set the state for the next pass.
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*/
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- *q = '\0';
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- strcat(dev_id, entry->d_name);
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- strcat(dev_id, "/device/device_id");
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+ snprintf(dev_id, sizeof(dev_id), "%s%s/device/device_id", kvp_net_dir,
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+ entry->d_name);
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file = fopen(dev_id, "r");
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if (file == NULL)
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@@ -680,28 +677,23 @@ static char *kvp_mac_to_if_name(char *mac)
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DIR *dir;
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struct dirent *entry;
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FILE *file;
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- char *p, *q, *x;
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+ char *p, *x;
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char *if_name = NULL;
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char buf[256];
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char *kvp_net_dir = "/sys/class/net/";
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- char dev_id[256];
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+ char dev_id[PATH_MAX];
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int i;
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dir = opendir(kvp_net_dir);
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if (dir == NULL)
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return NULL;
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- snprintf(dev_id, sizeof(dev_id), kvp_net_dir);
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- q = dev_id + strlen(kvp_net_dir);
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-
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while ((entry = readdir(dir)) != NULL) {
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/*
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* Set the state for the next pass.
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*/
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- *q = '\0';
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-
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- strcat(dev_id, entry->d_name);
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- strcat(dev_id, "/address");
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+ snprintf(dev_id, sizeof(dev_id), "%s%s/address", kvp_net_dir,
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+ entry->d_name);
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file = fopen(dev_id, "r");
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if (file == NULL)
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--
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1.7.11.7
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