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MDEV-17589: Stack-buffer-overflow with indexed varchar (utf8) field

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Create a new constant MAX_DATA_LENGTH_FOR_KEY.
Replace the value of MAX_KEY_LENGTH to also include the LENGTH and NULL BYTES
of a field.
This commit is contained in:
Varun Gupta
2018-12-19 10:34:30 +05:30
parent da4efd56aa
commit 7e606a2d5c
6 changed files with 79 additions and 7 deletions
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2
sql/table.cc
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@@ -1816,7 +1816,7 @@ int TABLE_SHARE::init_from_binary_frm_image(THD *thd, bool write,
uint pk_part_length= key_first_info->key_part[i].store_length;
if (keyinfo->ext_key_part_map & 1<<i)
{
if (ext_key_length + pk_part_length > MAX_KEY_LENGTH)
if (ext_key_length + pk_part_length > MAX_DATA_LENGTH_FOR_KEY)
{
add_keyparts_for_this_key= i;
break;