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add assert to prevent div by zero

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hathach 2019-11-01 18:03:43 +07:00
parent 83cbe32097
commit d0d87d98f6
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1 changed files with 6 additions and 2 deletions
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8
src/class/msc/msc_device.c
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@ -583,10 +583,14 @@ static void proc_read10_cmd(uint8_t rhport, mscd_interface_t* p_msc)
msc_cbw_t const * p_cbw = &p_msc->cbw; msc_cbw_t const * p_cbw = &p_msc->cbw;
msc_csw_t * p_csw = &p_msc->csw; msc_csw_t * p_csw = &p_msc->csw;
uint16_t const block_sz = p_cbw->total_bytes / rdwr10_get_blockcount(p_cbw->command); uint16_t const block_cnt = rdwr10_get_blockcount(p_cbw->command);
TU_ASSERT(block_cnt, ); // prevent div by zero
uint16_t const block_sz = p_cbw->total_bytes / block_cnt;
TU_ASSERT(block_sz, ); // prevent div by zero
// Adjust lba with transferred bytes // Adjust lba with transferred bytes
uint32_t const lba = rdwr10_get_lba(p_cbw->command) + (p_msc->xferred_len / block_sz); uint32_t lba = rdwr10_get_lba(p_cbw->command) + (p_msc->xferred_len / block_sz);
// remaining bytes capped at class buffer // remaining bytes capped at class buffer
int32_t nbytes = (int32_t) tu_min32(sizeof(_mscd_buf), p_cbw->total_bytes-p_msc->xferred_len); int32_t nbytes = (int32_t) tu_min32(sizeof(_mscd_buf), p_cbw->total_bytes-p_msc->xferred_len);