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Cap USB reads to remaining receive-buffer capacity and reset a full incomplete frame instead of writing beyond the fixed buffer.

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Signed-off-by: Pol Henarejos <pol.henarejos@cttc.es>
This commit is contained in:
Pol Henarejos
2026-07-12 19:36:36 +02:00
parent e6b991972f
commit 45f6a32104
1 changed files with 8 additions and 6 deletions
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src/usb/ccid/ccid.c
+8 -6
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@@ -162,16 +162,18 @@ void tud_vendor_rx_cb(uint8_t itf, const uint8_t *buffer, uint16_t bufsize) {
(void)bufsize;
uint32_t len = tud_vendor_n_available(itf);
do {
uint16_t tlen = 0;
if (len > 0xFFFF) {
tlen = 0xFFFF;
}
else {
tlen = (uint16_t)len;
uint16_t remaining = (uint16_t)(sizeof(ccid_rx[itf].buffer) - ccid_rx[itf].w_ptr);
if (remaining == 0) {
ccid_rx[itf].r_ptr = ccid_rx[itf].w_ptr = 0;
remaining = sizeof(ccid_rx[itf].buffer);
}
uint16_t tlen = len > remaining ? remaining : (uint16_t)len;
tlen = (uint16_t)tud_vendor_n_read(itf, ccid_rx[itf].buffer + ccid_rx[itf].w_ptr, tlen);
ccid_rx[itf].w_ptr += tlen;
driver_process_usb_packet_ccid(itf, tlen);
if (ccid_rx[itf].w_ptr == sizeof(ccid_rx[itf].buffer) && ccid_rx[itf].r_ptr == 0) {
ccid_rx[itf].r_ptr = ccid_rx[itf].w_ptr = 0;
}
len -= tlen;
} while (len > 0);
}