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apply fix for v3

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This commit is contained in:
iceman1001 2023-10-31 00:03:53 +01:00
parent b50b405128
commit 9835543a2f
1 changed files with 13 additions and 6 deletions
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19
client/src/fileutils.c
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@ -1157,7 +1157,8 @@ int loadFileJSONex(const char *preferredName, void *data, size_t maxdatalen, siz
uint8_t block[MFBLOCK_SIZE] = {0}; // ensure zero-filled when partial block of data read
JsonLoadBufAsHex(root, blocks, block, MFBLOCK_SIZE, &len);
if (!len) {
PrintAndLogEx(WARNING, "WARNING: json %s block %d has zero-length data ... file parsing stopped", ctype, i);
PrintAndLogEx(WARNING, "WARNING: json %s block %d has zero-length data", ctype, i);
PrintAndLogEx(INFO, "file parsing stopped");
break;
} else if (len != MFBLOCK_SIZE) {
PrintAndLogEx(WARNING, "WARNING: json %s block %d only has %d bytes, expected %d (will fill with zero data)", ctype, i, len, MFBLOCK_SIZE);
@ -1182,21 +1183,27 @@ int loadFileJSONex(const char *preferredName, void *data, size_t maxdatalen, siz
*datalen = MFU_DUMP_PREFIX_LENGTH;
size_t sptr = 0;
for (int i = 0; i < maxdatalen; i++) {
// load blocks (i) from 0..N, but check sptr against total data length, not `i`
for (int i = 0; sptr < maxdatalen; i++) {
if (sptr + MFBLOCK_SIZE > maxdatalen) {
PrintAndLogEx(ERR, "loadFileJSONex: maxdatalen=%4d (%04x) block (i)=%4d (%04x) sptr=%4d (%04x) -- exceeded maxdatalen", maxdatalen, maxdatalen, i, i, sptr, sptr);
retval = PM3_EMALLOC;
goto out;
}
snprintf(blocks, sizeof(blocks), "$.blocks.%d", i);
uint8_t block[MFBLOCK_SIZE];
uint8_t block[MFBLOCK_SIZE] = {0}; // ensure zero-filled when partial block of data read
JsonLoadBufAsHex(root, blocks, block, MFBLOCK_SIZE, &len);
if (!len)
if (!len) {
PrintAndLogEx(WARNING, "WARNING: json %s block %d has zero-length data", ctype, i);
PrintAndLogEx(INFO, "file parsing stopped");
break;
} else if (len != MFBLOCK_SIZE) {
PrintAndLogEx(WARNING, "WARNING: json %s block %d only has %d bytes, expected %d (will fill with zero data)", ctype, i, len, MFBLOCK_SIZE);
}
memcpy(&udata.bytes[sptr], block, MFBLOCK_SIZE);
sptr += len;
sptr += MFBLOCK_SIZE; // always increment pointer by the full block size, even if only partial data read from dump file
}
*datalen = sptr;