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Prevent potential stack corruption

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Henry Gabryjelski 2025-01-10 16:59:49 -08:00
commit 18f6604eb0
1 changed files with 10 additions and 2 deletions
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12
client/src/cmdlfem4x50.c
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@ -30,10 +30,12 @@
static int CmdHelp(const char *Cmd);
static void em4x50_prepare_result(const uint8_t *data, int fwr, int lwr, em4x50_word_t *words) {
// Each record is 4 bytes long ... a single line in the dump output
// Reads each record from `data`, reverses the four bytes, and writes to `words`
static void em4x50_prepare_result(const uint8_t *data, int first_record_inclusive, int last_record_inclusive, em4x50_word_t *words) {
// restructure received result in "em4x50_word_t" structure
for (int i = fwr; i <= lwr; i++) {
for (int i = first_record_inclusive; i <= last_record_inclusive; i++) {
for (int j = 0; j < 4; j++) {
words[i].byte[j] = data[i * 4 + (3 - j)];
}
@ -779,6 +781,12 @@ static int CmdEM4x50Reader(const char *Cmd) {
// iceman, misuse of return status code.
int now = resp.status;
// prevent massive stack corruption if unexpected results from device.
if (now > EM4X50_NO_WORDS) {
PrintAndLogEx(WARNING, "word count was: %d, limiting to %d", now, EM4X50_NO_WORDS);
now = EM4X50_NO_WORDS;
}
if (now > 0) {
em4x50_word_t words[EM4X50_NO_WORDS];