Segmentation fault #6
Description
I am testing strtt on a STM32U5, it finds the RTT info but then crashes
./strtt -v 4 -ramstart 0x2023af49
I added some debugging code, but I don't know how to fix this:
strtt.cpp:272
// 2. Enumerate buffers start and size
for (size_t i = 0; i < buffersCnt; i++)
{
// check only valid channels, eg. with size > 0 AND and something to read
SEGGER_RTT_BUFFER bufferDesc = this->_rtt_info.pRttDescription->buffDesc[i];
if ((bufferDesc.SizeOfBuffer) && (bufferDesc.RdOff != bufferDesc.WrOff))
{
start = bufferDesc.pBuffer - ramStart;
size = bufferDesc.SizeOfBuffer;
LOG_DEBUG("readrtt: pushblock pb=%u, rs=%u start = %u, size = %u",bufferDesc.pBuffer, ramStart,start, size);
blocks.push_back(std::make_pair(start, size));
}
}
Debug: 96 62 strtt.cpp:281 readRtt(): readrtt: pushblock pb=539208521, rs=539209545 start = 4294966272, size = 1024
Somehow bufferDesc.pBuffer < ramStart, which causes start to overflow, which in turn causes _memory[start] to fail.
LOG_DEBUG("readrtt: read2 %u bytes start=%u memsz=%lu", size,start, this->_memory.size());
// ret = stlink_usb_layout_api.read_mem(this->_handle, start + RAM_START, -1, size, &this->_memory[start]);
ret = stlink_usb_layout_api.read_mem(this->_handle, start + ramStart, -1, ((size / 4) * 4) + 4, &this->_memory[start]);