Wireshark · Wireshark-dev: [Wireshark-dev] call to cf_read(&cfile) corrupts stack

[LEGO <luis.ontanon@xxxxxxxxx>]

Hi folks,

while writing an open_capture_file() function for lua I came up with
an odd situation.

When executing the following code more than once, during the cf_read
call the stack gets overwritten.

	if (cf_open(&cfile, fname, FALSE, &err) != CF_OK) {
		return FALSE;
	}
	cfile.rfcode = rfcode;
	
	switch (cf_read(&cfile)) {
		case CF_READ_OK:
		case CF_READ_ERROR:
			break;
		default:
			return FALSE;
	}

overwriting happens when calling wtap_read() from file.c:405

I tried to understand why this happens but nothing appears to me to be
the cause.

Is there something I should do before calling cf_open() to avoid this happening.

Thanks,
Luis


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