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Fix use-after-free in some cases of reassigning a table index.

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Specifically observed when redef'ing the same index of a table that uses
subnets as indices, though the bug seems like it applies more generally
to anytime TableVal::Assign is provided with just the HashKey parameter
and not the index Val.

Addresses BIT-1202.
This commit is contained in:
Jon Siwek 2014-06-10 13:38:32 -05:00
parent c289a2743b
commit e616554ab8
3 changed files with 29 additions and 3 deletions
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11
src/Val.cc
View file

@ -1471,13 +1471,19 @@ int TableVal::Assign(Val* index, HashKey* k, Val* new_val, Opcode op)
}
TableEntryVal* new_entry_val = new TableEntryVal(new_val);
HashKey k_copy(k->Key(), k->Size(), k->Hash());
TableEntryVal* old_entry_val = AsNonConstTable()->Insert(k, new_entry_val);
// If the dictionary index already existed, the insert may free up the
// memory allocated to the key bytes, so have to assume k is invalid
// from here on out.
delete k;
k = 0;
if ( subnets )
{
if ( ! index )
{
Val* v = RecoverIndex(k);
Val* v = RecoverIndex(&k_copy);
subnets->Insert(v, new_entry_val);
Unref(v);
}
@ -1489,7 +1495,7 @@ int TableVal::Assign(Val* index, HashKey* k, Val* new_val, Opcode op)
{
Val* rec_index = 0;
if ( ! index )
index = rec_index = RecoverIndex(k);
index = rec_index = RecoverIndex(&k_copy);
if ( new_val )
{
@ -1547,7 +1553,6 @@ int TableVal::Assign(Val* index, HashKey* k, Val* new_val, Opcode op)
if ( old_entry_val && attrs && attrs->FindAttr(ATTR_EXPIRE_CREATE) )
new_entry_val->SetExpireAccess(old_entry_val->ExpireAccessTime());
delete k;
if ( old_entry_val )
{
old_entry_val->Unref();