layerscape: fix get_device_file() function of restool

The restool failed to work with current gcc-7.3.0-musl.
This patch is to add a restool fix-up patch to fix
multiple problems encountered in the get_device_file()
function:
 - The deprecated atoi() function is replaced by strtoul
 - An invalid memory access was being performed by using
 memory from dir->d_name even after closedir(). This is
 fixed by a strdup() on the device filename.
 - Also, error prints now print any relevant error code.

Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>

package/network/utils/layerscape/restool/patches/0001-restool-fix-get_device_file-function.patch

@@ -0,0 +1,107 @@
+From 37f0f1550e7822584b858edde416a694fb902236 Mon Sep 17 00:00:00 2001
+From: Ioana Ciornei <ioana.ciornei@nxp.com>
+Date: Tue, 31 Jul 2018 13:33:20 +0300
+Subject: [PATCH] restool: fix get_device_file() function
+
+This patch fixes multiple problems encountered in the
+get_device_file() function:
+ - The deprecated atoi() function is replaced by strtoul
+ - An invalid memory access was being performed by using
+ memory from dir->d_name even after closedir(). This is
+ fixed by a strdup() on the device filename.
+ - Also, error prints now print any relevant error code.
+
+Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
+---
+ restool.c | 44 ++++++++++++++++++++++++++++----------------
+ 1 file changed, 28 insertions(+), 16 deletions(-)
+
+diff --git a/restool.c b/restool.c
+index 7553659..78fd1bf 100644
+--- a/restool.c
++++ b/restool.c
+@@ -1185,8 +1185,13 @@ out:
+ 
+ static int get_device_file(void)
+ {
++	int num_dev_files = 0;
++	struct dirent *dir;
+ 	int error = 0;
++	char *device;
+ 	int num_char;
++	long val;
++	DIR *d;
+ 
+ 	memset(restool.device_file, '\0', DEV_FILE_SIZE);
+ 
+@@ -1214,10 +1219,6 @@ static int get_device_file(void)
+ 			goto out;
+ 		}
+ 	} else {
+-		DIR           *d;
+-		struct dirent *dir;
+-		int num_dev_files = 0;
+-		char *dprc_index;
+ 
+ 		d = opendir("/dev");
+ 		if (!d) {
+@@ -1227,26 +1228,34 @@ static int get_device_file(void)
+ 		}
+ 		while ((dir = readdir(d)) != NULL) {
+ 			if (strncmp(dir->d_name, "dprc.", 5) == 0) {
+-				dprc_index = &dir->d_name[5];
+-				num_dev_files += 1;
++				if (num_dev_files == 0)
++					device = strdup(dir->d_name);
++				num_dev_files++;
+ 			}
+ 		}
+ 		closedir(d);
+ 
+ 		if (num_dev_files == 1) {
+-			int temp_len = strlen(dprc_index);
++			errno = 0;
++			val = strtoul(&device[5], NULL, 0);
++			if ((errno == ERANGE && val == LONG_MAX) ||
++			    ( errno != 0 && val == 0 )) {
++				ERROR_PRINTF("error: device file malformed\n");
++				error = -1;
++				goto out_free_device;;
++			}
++			restool.root_dprc_id = val;
+ 
+-			temp_len += 10;
+-			num_char = sprintf(restool.device_file, "/dev/dprc.%s",
+-					   dprc_index);
+-			if (num_char != temp_len) {
+-				ERROR_PRINTF("sprintf error\n");
++			num_char = snprintf(restool.device_file, DEV_FILE_SIZE,
++					    "/dev/dprc.%d", restool.root_dprc_id);
++			if (num_char < 0 || num_char >= DEV_FILE_SIZE) {
++				ERROR_PRINTF("error: device file malformed\n");
+ 				error = -1;
+-				goto out;
++				goto out_free_device;
+ 			}
+-			restool.root_dprc_id = atoi(dprc_index);
+-			if (access(restool.device_file, F_OK) != 0)
+-				printf("no such dev file\n");
++			error = access(restool.device_file, F_OK);
++			if (error != 0)
++				ERROR_PRINTF("error: access(%s) = %d\n", restool.device_file, error);
+ 		} else {
+ 			error = -1;
+ 			if (num_dev_files == 0)
+@@ -1255,6 +1264,9 @@ static int get_device_file(void)
+ 				ERROR_PRINTF("error: multiple root containers\n");
+ 		}
+ 	}
++
++out_free_device:
++	free(device);
+ out:
+ 	return error;
+ }
+-- 
+2.17.1
+