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MergedTransaction: Fix invalid memory access when dropping items #1658

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merged 1 commit into from
Apr 24, 2024
Merged

MergedTransaction: Fix invalid memory access when dropping items #1658

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18 changes: 11 additions & 7 deletions libdnf/transaction/MergedTransaction.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -264,14 +264,15 @@ getItemIdentifier(ItemPtr item)

/**
* Resolve the difference between RPMs in the first and second transaction item
* and create a ItemPair of Upgrade, Downgrade or drop the item from the merged
* transaction set in case of both packages are of the same version.
* Method is called when original package is being removed and than installed again.
* and create a ItemPair of Upgrade, Downgrade or remove the item from the merged
* transaction set in case of both packages are the same.
* Method is called when original package is being removed and then installed again.
* \param itemPairMap merged transaction set
* \param previousItemPair original item pair
* \param mTransItem new transaction item
* \return true if the original and new transaction item differ
*/
void
bool
MergedTransaction::resolveRPMDifference(ItemPairMap &itemPairMap,
ItemPair &previousItemPair,
TransactionItemBasePtr mTransItem)
Expand All @@ -287,7 +288,7 @@ MergedTransaction::resolveRPMDifference(ItemPairMap &itemPairMap,
firstRPM->getRelease() == secondRPM->getRelease()) {
// Drop the item from merged transaction
itemPairMap.erase(getItemIdentifier(firstItem));
return;
return false;
} else if ((*firstRPM) < (*secondRPM)) {
// Upgrade to secondRPM
previousItemPair.first->setAction(TransactionItemAction::UPGRADED);
Expand All @@ -298,6 +299,7 @@ MergedTransaction::resolveRPMDifference(ItemPairMap &itemPairMap,
mTransItem->setAction(TransactionItemAction::DOWNGRADE);
}
previousItemPair.second = mTransItem;
return true;
}

void
Expand All @@ -308,12 +310,14 @@ MergedTransaction::resolveErase(ItemPairMap &itemPairMap,
/*
* The original item has been removed - it has to be installed now unless the rpmdb
* has changed. Resolve the difference between packages and mark it as Upgrade,
* Reinstall or Downgrade
* Downgrade or remove it from the transaction
*/
if (mTransItem->getAction() == TransactionItemAction::INSTALL) {
if (mTransItem->getItem()->getItemType() == ItemType::RPM) {
// resolve the difference between RPM packages
resolveRPMDifference(itemPairMap, previousItemPair, mTransItem);
if (!resolveRPMDifference(itemPairMap, previousItemPair, mTransItem)) {
return;
}
} else {
// difference between comps can't be resolved
mTransItem->setAction(TransactionItemAction::REINSTALL);
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2 changes: 1 addition & 1 deletion libdnf/transaction/MergedTransaction.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -76,7 +76,7 @@ class MergedTransaction {
typedef std::map< std::string, ItemPair > ItemPairMap;

void mergeItem(ItemPairMap &itemPairMap, TransactionItemBasePtr transItem);
void resolveRPMDifference(ItemPairMap &itemPairMap, ItemPair &previousItemPair, TransactionItemBasePtr mTransItem);
bool resolveRPMDifference(ItemPairMap &itemPairMap, ItemPair &previousItemPair, TransactionItemBasePtr mTransItem);
void resolveErase(ItemPairMap &itemPairMap, ItemPair &previousItemPair, TransactionItemBasePtr mTransItem);
void resolveAltered(ItemPairMap &itemPairMap, ItemPair &previousItemPair, TransactionItemBasePtr mTransItem);
};
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