[freetds] blk_in error

Lowden, James K LowdenJK at bernstein.com
Mon Jul 26 12:28:31 EDT 2004

> From: ZIGLIO, Frediano, VF-IT
> Sent: Monday, July 26, 2004 11:05 AM
> blk_in test (ctlib) produce this core
> (gdb) bt
> #0  0x4000a0da in cs_convert (ctx=0x804c570, srcfmt=0x0, 
                                            looks odd ^^^
> srcdata=0x804adc0, destfmt=0xbffff780, destdata=0x0,
> resultlen=0xbffff77c) at cs.c:604
> #1  0x4000cfe3 in _blk_get_col_data (blkdesc=0x4000a0ce, 
> bindcol=0x8092600, offset=0) at blk.c:1580 
> #2  0x4000c509 in 
> _blk_build_bcp_record (blkdesc=0x804d438, offset=0,
> record_len=0x4000a0ce) at blk.c:1148
> #3  0x4000b97f in _blk_rowxfer_in (blkdesc=0x804d438, rows_to_xfer=1,
> rows_xferred=0xbffff988) at blk.c:719
> #4  0x4000b6fc in blk_rowxfer_mult (blkdesc=0x804d438,
> row_count=0xbffff9b0) at blk.c:559
> #5  0x4000b67e in blk_rowxfer (blkdesc=0x804d438) at 
> blk.c:540 #6  0x0804912d in main (argc=1, argv=0xbffffa34) at 
> blk_in.c:265

Works for me using TDS 8.0 or 7.0:

$ ./blk_in
../../../../src/ctlib/unittests/blk_in.c: Retrieve data using array
Sending same row 10 times...
10 rows copied.

AFAICT, _blk_get_col_data() cannot pass a null srcfmt pointer to
cs_convert().  The call is:

	if ((result = cs_convert(ctx, &srcfmt, (CS_VOID *) src,

The backtrace shows srcfmt=0x0, so I suspect stack corruption in


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