fritz-tools: fix returning wrong values due to strncmp usage

When having two keys that start with the same characters and the second
key just has one character more nand_tffs_read and tffs_read return the
wrong value for the longer key. This is due to the usage of strncmp in
combination with the length of the shorter key which is usually first in
the list before the longer key and when strncmp matches, the search is
stopped. The problem only occurs when the length of the two keys is
different, not if just the last character is different. The fix is to
use strcmp and as such it will only return the value if the key (name)
and the key to look for (namefilter) have the same value and length. A
sample case returning wrong values is when keys macwlan and macwlan2 are
defined and querying macwlan2 returns the value for macwlan.

Signed-off-by: Daniel Kestrel <kestrel1974@t-online.de>
(cherry picked from commit 12564c5b860f9849c9a2fb7026c2c11150b9a4fc)

diff --git a/package/utils/fritz-tools/src/fritz_tffs_nand_read.c b/package/utils/fritz-tools/src/fritz_tffs_nand_read.c
index ded0577cf3f2113c78ad722a0d6772a1a377bfef..22b27336f89df0b8a2ba0f6ccfead585604b9a7f 100644 (file)
--- a/package/utils/fritz-tools/src/fritz_tffs_nand_read.c
+++ b/package/utils/fritz-tools/src/fritz_tffs_nand_read.c
@@ -340,7 +340,7 @@ static int show_matching_key_value(struct tffs_key_name_table *key_names)
        for (uint32_t i = 0; i < key_names->size; i++) {
                name = key_names->entries[i].val;
 
-               if (strncmp(name, name_filter, strlen(name)) == 0) {
+               if (strcmp(name, name_filter) == 0) {
                        if (find_entry(key_names->entries[i].id, &tmp)) {
                                print_entry_value(&tmp);
                                printf("\n");

diff --git a/package/utils/fritz-tools/src/fritz_tffs_read.c b/package/utils/fritz-tools/src/fritz_tffs_read.c
index d1b3038e63a9333c638d1acd6f7a988b20d39ce4..256c34c41421cbf0b5693011b83fc747d029cd0f 100644 (file)
--- a/package/utils/fritz-tools/src/fritz_tffs_read.c
+++ b/package/utils/fritz-tools/src/fritz_tffs_read.c
@@ -204,7 +204,7 @@ static int show_matching_key_value(uint8_t *buffer,
        for (i = 0; i < key_names->size; i++) {
                name = key_names->entries[i].val;
 
-               if (strncmp(name, name_filter, strlen(name)) == 0) {
+               if (strcmp(name, name_filter) == 0) {
                        id = to_entry_header_id(*key_names->entries[i].id);
 
                        if (find_entry(buffer, id, &tmp)) {