[freetds] assert in odbc driver for long error messages
mabrand at mabrand.nl
Tue Apr 17 09:35:23 EDT 2012
It seems that a rather long error message raised from a stored procedure
triggers an ASSERT in the FreeTDS ODBC driver:
unicode: odbc_util.c:391: odbc_set_string_flag: Assertion `dest ==
((void *)0) || dest-(SQLWCHAR*) buffer == out_len' failed.
The attached rather primitive code illustrates the problem. The stored
procedure is in the comment at the top.
I'm not very familiar with the code in question, but it looks to me that
odbc_set_string_flag() is copying more than bytes than the limit imposed
by cbBuffer, which is called cbErrorMsgMax from tdsdump_log() in
error.c. In my debugger I see that initial_size is 1024 while out_len is
1127 just before the ASSERT.
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