Hi Varun, On Mon, Feb 13, 2017 at 03:47:57AM +0530, Varun wrote:

revision-id: 13ebc9c826de080e416071b7881585b45922bef9 (mariadb-10.2.3-185-g13ebc9c) parent(s): 3ae038b732ce503fb839e9095355e05f5c6866f9 author: Varun Gupta committer: Varun Gupta timestamp: 2017-02-13 03:45:59 +0530 message:

MDEV-11645: archive.archive fails in buildbot with valgrind (Use of uninitialised value)

Set null values to record_buffer->buffer for the VARCHAR fields

--- storage/archive/ha_archive.cc | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+)

diff --git a/storage/archive/ha_archive.cc b/storage/archive/ha_archive.cc index 9d6d100..329e3d5 100644 --- a/storage/archive/ha_archive.cc +++ b/storage/archive/ha_archive.cc @@ -372,10 +372,31 @@ int Archive_share::write_v1_metafile()

unsigned int ha_archive::pack_row_v1(uchar *record) { + uint offset= 0,length; uint *blob, *end; uchar *pos; DBUG_ENTER("pack_row_v1"); memcpy(record_buffer->buffer, record, table->s->reclength); + for(Field** field= table->field; (*field) ; field++) + { + + Field *fld= *field; + + if(fld->type() == MYSQL_TYPE_VARCHAR) + { + uint start= (fld->ptr - table->record[0]); + uint index_end= start+fld->field_length; There is no reason to compute the above variables when the field value is an SQL NULL. Please move them into the if. Please also use ptrdiff_t datatype instead of uint.

+ + if(!(fld->is_real_null(record - table->record[0]))) + { + Field_varstring *const field_var = (Field_varstring *)fld; + offset = field_var->data_length() + field_var->length_size(); Coding style says there should be no space before the assignment. Please fix

A different question: did you check what happens when one attempts to write an SQL NULL value? the above two lines.

+ + for(uint index= start + offset; index <= index_end ; index++) + record_buffer->buffer[index]=0;

Is there any reason you're not using bzero or memset call here instead? (please check with Serg which one is guaranteed to be available)

+ } + } + } pos= record_buffer->buffer + table->s->reclength; for (blob= table->s->blob_field, end= blob + table->s->blob_fields; blob != end; blob++)

BR Sergei -- Sergei Petrunia, Software Developer MariaDB Corporation | Skype: sergefp | Blog: http://s.petrunia.net/blog