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myisam/mi_packrec.c

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more robust checks (catch more corruptions)


myisam/mi_packrec.c:
  more robust checks (catch more corruptions)
This commit is contained in:
unknown 2004-12-02 15:14:36 +01:00
commit 66c3afa363
1 changed files with 16 additions and 11 deletions
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31
myisam/mi_packrec.c
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@ -42,6 +42,7 @@
{ bits-=(bit+1); break; } \
pos+= *pos
#define OFFSET_TABLE_SIZE 512
static uint read_huff_table(MI_BIT_BUFF *bit_buff,MI_DECODE_TREE *decode_tree,
uint16 **decode_table,byte **intervall_buff,
@ -53,7 +54,7 @@ static void fill_quick_table(uint16 *table,uint bits, uint max_bits,
uint value);
static uint copy_decode_table(uint16 *to_pos,uint offset,
uint16 *decode_table);
static uint find_longest_bitstream(uint16 *table);
static uint find_longest_bitstream(uint16 *table, uint16 *end);
static void (*get_unpack_function(MI_COLUMNDEF *rec))(MI_COLUMNDEF *field,
MI_BIT_BUFF *buff,
uchar *to,
@ -178,7 +179,7 @@ my_bool _mi_read_pack_info(MI_INFO *info, pbool fix_keys)
length=(uint) (elements*2+trees*(1 << myisam_quick_table_bits));
if (!(share->decode_tables=(uint16*)
my_malloc((length+512)*sizeof(uint16)+
my_malloc((length+OFFSET_TABLE_SIZE)*sizeof(uint16)+
(uint) (share->pack.header_length+7),
MYF(MY_WME | MY_ZEROFILL))))
{
@ -186,7 +187,7 @@ my_bool _mi_read_pack_info(MI_INFO *info, pbool fix_keys)
goto err1;
}
tmp_buff=share->decode_tables+length;
disk_cache=(byte*) (tmp_buff+512);
disk_cache=(byte*) (tmp_buff+OFFSET_TABLE_SIZE);
if (my_read(file,disk_cache,
(uint) (share->pack.header_length-sizeof(header)),
@ -302,7 +303,7 @@ static uint read_huff_table(MI_BIT_BUFF *bit_buff, MI_DECODE_TREE *decode_tree,
decode_tree->intervalls= *intervall_buff;
if (! intervall_length)
{
table_bits=find_longest_bitstream(tmp_buff);
table_bits=find_longest_bitstream(tmp_buff, tmp_buff+OFFSET_TABLE_SIZE);
if (table_bits == (uint) ~0)
return 1;
if (table_bits > myisam_quick_table_bits)
@ -397,19 +398,23 @@ static uint copy_decode_table(uint16 *to_pos, uint offset,
}
static uint find_longest_bitstream(uint16 *table)
static uint find_longest_bitstream(uint16 *table, uint16 *end)
{
uint length=1,length2;
if (*table > 512)
return ~0;
if (!(*table & IS_CHAR))
length=find_longest_bitstream(table+ *table)+1;
table++;
if (*table > 512)
return ~0;
if (!(*table & IS_CHAR))
{
length2=find_longest_bitstream(table+ *table)+1;
uint16 *next= table + *table;
if (next > end || next == table)
return ~0;
length=find_longest_bitstream(next, end)+1;
}
table++;
if (!(*table & IS_CHAR))
{
uint16 *next= table + *table;
if (next > end || next == table)
return ~0;
length2=find_longest_bitstream(table+ *table, end)+1;
length=max(length,length2);
}
return length;