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  • From: "Lowden, James K" <LowdenJK AT bernstein.com>
  • To: "FreeTDS Development Group" <freetds AT lists.ibiblio.org>
  • Subject: RE: [freetds] blk_in error
  • Date: Mon, 26 Jul 2004 12:28:31 -0400

> 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
binding
Sending same row 10 times...
10 rows copied.
done

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
cs_convert().

--jkl


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