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[FL-3643] Fix crash when reading files > 64B (#3166)

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* Increase MF DESFire result buffer
* Ignore chunks that do not fit into the result buffer and show warning
* Display information about partial files

Co-authored-by: あく <alleteam@gmail.com>
This commit is contained in:
Georgii Surkov 2023-10-28 17:29:14 +03:00 committed by GitHub
parent 3d872cf37a
commit cfaf745523
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GPG key ID: 4AEE18F83AFDEB23
3 changed files with 32 additions and 7 deletions
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18
applications/main/nfc/helpers/protocol_support/mf_desfire/mf_desfire_render.c
View file

@ -190,6 +190,8 @@ void nfc_render_mf_desfire_file_settings_data(
uint32_t record_count = 1;
uint32_t record_size = 0;
const uint32_t total_size = simple_array_get_count(data->data);
switch(settings->type) {
case MfDesfireFileTypeStandard:
case MfDesfireFileTypeBackup:
@ -220,9 +222,20 @@ void nfc_render_mf_desfire_file_settings_data(
}
for(uint32_t rec = 0; rec < record_count; rec++) {
furi_string_cat_printf(str, "record %lu\n", rec);
const uint32_t size_offset = rec * record_size;
const uint32_t size_remaining = total_size > size_offset ? total_size - size_offset : 0;
if(size_remaining < record_size) {
furi_string_cat_printf(
str, "record %lu (partial %lu of %lu)\n", rec, size_remaining, record_size);
record_size = size_remaining;
} else {
furi_string_cat_printf(str, "record %lu\n", rec);
}
for(uint32_t ch = 0; ch < record_size; ch += 4) {
furi_string_cat_printf(str, "%03lx|", ch);
for(uint32_t i = 0; i < 4; i++) {
if(ch + i < record_size) {
const uint32_t data_index = rec * record_size + ch + i;
@ -233,6 +246,7 @@ void nfc_render_mf_desfire_file_settings_data(
furi_string_cat_printf(str, " ");
}
}
for(uint32_t i = 0; i < 4 && ch + i < record_size; i++) {
const uint32_t data_index = rec * record_size + ch + i;
const uint8_t data_byte =
@ -243,8 +257,10 @@ void nfc_render_mf_desfire_file_settings_data(
furi_string_cat_printf(str, ".");
}
}
furi_string_push_back(str, '\n');
}
furi_string_push_back(str, '\n');
}
}

11
lib/nfc/protocols/mf_desfire/mf_desfire_poller.c
View file

@ -6,7 +6,8 @@
#define TAG "MfDesfirePoller"
#define MF_DESFIRE_BUF_SIZE_MAX (64U)
#define MF_DESFIRE_BUF_SIZE (64U)
#define MF_DESFIRE_RESULT_BUF_SIZE (512U)
typedef NfcCommand (*MfDesfirePollerReadHandler)(MfDesfirePoller* instance);
@ -20,10 +21,10 @@ static MfDesfirePoller* mf_desfire_poller_alloc(Iso14443_4aPoller* iso14443_4a_p
MfDesfirePoller* instance = malloc(sizeof(MfDesfirePoller));
instance->iso14443_4a_poller = iso14443_4a_poller;
instance->data = mf_desfire_alloc();
instance->tx_buffer = bit_buffer_alloc(MF_DESFIRE_BUF_SIZE_MAX);
instance->rx_buffer = bit_buffer_alloc(MF_DESFIRE_BUF_SIZE_MAX);
instance->input_buffer = bit_buffer_alloc(MF_DESFIRE_BUF_SIZE_MAX);
instance->result_buffer = bit_buffer_alloc(MF_DESFIRE_BUF_SIZE_MAX);
instance->tx_buffer = bit_buffer_alloc(MF_DESFIRE_BUF_SIZE);
instance->rx_buffer = bit_buffer_alloc(MF_DESFIRE_BUF_SIZE);
instance->input_buffer = bit_buffer_alloc(MF_DESFIRE_BUF_SIZE);
instance->result_buffer = bit_buffer_alloc(MF_DESFIRE_RESULT_BUF_SIZE);
instance->mf_desfire_event.data = &instance->mf_desfire_event_data;

10
lib/nfc/protocols/mf_desfire/mf_desfire_poller_i.c
View file

@ -59,7 +59,15 @@ MfDesfireError mf_desfire_send_chunks(
break;
}
bit_buffer_append_right(rx_buffer, instance->rx_buffer, sizeof(uint8_t));
const size_t rx_size = bit_buffer_get_size_bytes(instance->rx_buffer);
const size_t rx_capacity_remaining =
bit_buffer_get_capacity_bytes(rx_buffer) - bit_buffer_get_size_bytes(rx_buffer);
if(rx_size <= rx_capacity_remaining) {
bit_buffer_append_right(rx_buffer, instance->rx_buffer, sizeof(uint8_t));
} else {
FURI_LOG_W(TAG, "RX buffer overflow: ignoring %zu bytes", rx_size);
}
}
} while(false);