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audio_device: Fix FIFO element size discrepancies

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Buffer for TX and RX FIFO was not taking into account
size of element leading to out of bound access.

audio_tx_done_type_I_pcm_ff_cb() reported copied bytes was not returning
correct value number if channels was omitted in computation.

Transfer size calculation uses simpler arithmetic.
This commit is contained in:
Jerzy Kasenberg
2020-08-25 13:15:43 +02:00
parent c61e9fb96d
commit a4c096be37
1 changed files with 10 additions and 10 deletions
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20
src/class/audio/audio_device.c
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@@ -80,7 +80,7 @@ typedef struct
// FIFO
#if CFG_TUD_AUDIO_EPSIZE_IN && CFG_TUD_AUDIO_TX_FIFO_SIZE
tu_fifo_t tx_ff[CFG_TUD_AUDIO_N_CHANNELS_TX];
CFG_TUSB_MEM_ALIGN uint8_t tx_ff_buf[CFG_TUD_AUDIO_N_CHANNELS_TX][CFG_TUD_AUDIO_TX_FIFO_SIZE];
CFG_TUSB_MEM_ALIGN uint8_t tx_ff_buf[CFG_TUD_AUDIO_N_CHANNELS_TX][CFG_TUD_AUDIO_TX_FIFO_SIZE * CFG_TUD_AUDIO_TX_ITEMSIZE];
#if CFG_FIFO_MUTEX
osal_mutex_def_t tx_ff_mutex[CFG_TUD_AUDIO_N_CHANNELS_TX];
#endif
@@ -88,7 +88,7 @@ typedef struct
#if CFG_TUD_AUDIO_EPSIZE_OUT && CFG_TUD_AUDIO_RX_FIFO_SIZE
tu_fifo_t rx_ff[CFG_TUD_AUDIO_N_CHANNELS_RX];
CFG_TUSB_MEM_ALIGN uint8_t rx_ff_buf[CFG_TUD_AUDIO_N_CHANNELS_RX][CFG_TUD_AUDIO_RX_FIFO_SIZE];
CFG_TUSB_MEM_ALIGN uint8_t rx_ff_buf[CFG_TUD_AUDIO_N_CHANNELS_RX][CFG_TUD_AUDIO_RX_FIFO_SIZE * CFG_TUD_AUDIO_RX_ITEMSIZE];
#if CFG_FIFO_MUTEX
osal_mutex_def_t rx_ff_mutex[CFG_TUD_AUDIO_N_CHANNELS_RX];
#endif
@@ -404,10 +404,12 @@ static bool audio_tx_done_type_I_pcm_ff_cb(uint8_t rhport, audiod_interface_t* a
TU_VERIFY(!usbd_edpt_busy(rhport, audio->ep_in));
// Determine amount of samples
uint16_t nSamplesPerChannelToSend = 0xFFFF;
uint16_t const nEndpointSampleCapacity = CFG_TUD_AUDIO_EPSIZE_IN / CFG_TUD_AUDIO_N_CHANNELS_TX / CFG_TUD_AUDIO_N_BYTES_PER_SAMPLE_TX;
uint16_t nSamplesPerChannelToSend = tu_fifo_count(&audio->tx_ff[0]);
uint16_t nBytesToSend;
uint8_t cntChannel;
for (cntChannel = 0; cntChannel < CFG_TUD_AUDIO_N_CHANNELS_TX; cntChannel++)
for (cntChannel = 1; cntChannel < CFG_TUD_AUDIO_N_CHANNELS_TX; cntChannel++)
{
if (audio->tx_ff[cntChannel].count < nSamplesPerChannelToSend)
{
@@ -423,10 +425,8 @@ static bool audio_tx_done_type_I_pcm_ff_cb(uint8_t rhport, audiod_interface_t* a
}
// Limit to maximum sample number - THIS IS A POSSIBLE ERROR SOURCE IF TOO MANY SAMPLE WOULD NEED TO BE SENT BUT CAN NOT!
if (nSamplesPerChannelToSend * CFG_TUD_AUDIO_N_CHANNELS_TX * CFG_TUD_AUDIO_N_BYTES_PER_SAMPLE_TX > CFG_TUD_AUDIO_EPSIZE_IN)
{
nSamplesPerChannelToSend = CFG_TUD_AUDIO_EPSIZE_IN / CFG_TUD_AUDIO_N_CHANNELS_TX / CFG_TUD_AUDIO_N_BYTES_PER_SAMPLE_TX;
}
nSamplesPerChannelToSend = min(nSamplesPerChannelToSend, nEndpointSampleCapacity);
nBytesToSend = nSamplesPerChannelToSend * CFG_TUD_AUDIO_N_CHANNELS_TX * CFG_TUD_AUDIO_N_BYTES_PER_SAMPLE_TX;
// Encode
uint16_t cntSample;
@@ -456,8 +456,8 @@ static bool audio_tx_done_type_I_pcm_ff_cb(uint8_t rhport, audiod_interface_t* a
}
// Schedule transmit
TU_VERIFY(usbd_edpt_xfer(rhport, audio->ep_in, audio->epin_buf, nSamplesPerChannelToSend*CFG_TUD_AUDIO_N_BYTES_PER_SAMPLE_TX));
*n_bytes_copied = nSamplesPerChannelToSend*CFG_TUD_AUDIO_N_BYTES_PER_SAMPLE_TX;
TU_VERIFY(usbd_edpt_xfer(rhport, audio->ep_in, audio->epin_buf, nBytesToSend));
*n_bytes_copied = nBytesToSend;
return true;
}