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authorJoel Hestness <jthestness@gmail.com>2015-09-29 09:28:26 -0500
committerJoel Hestness <jthestness@gmail.com>2015-09-29 09:28:26 -0500
commitc05d268cfabbe26d032d73abcea6dc921c49e549 (patch)
tree9a868b284e3e7e1a45dfdb6d31338e0139fa048e /src/mem/ruby
parent0ecaab4ea8039f707a95f5e3efcc68591dbcd407 (diff)
downloadgem5-c05d268cfabbe26d032d73abcea6dc921c49e549.tar.xz
ruby: Fix CacheMemory allocate leak
If a cache entry permission was previously set to NotPresent, but the entry was not deleted, a following cache allocation can cause the entry to be leaked by setting the entry pointer to a newly allocated entry. To eliminate this possibility, check if the new entry is different from the old one, and if so, delete the old one.
Diffstat (limited to 'src/mem/ruby')
-rw-r--r--src/mem/ruby/structures/CacheMemory.cc7
1 files changed, 7 insertions, 0 deletions
diff --git a/src/mem/ruby/structures/CacheMemory.cc b/src/mem/ruby/structures/CacheMemory.cc
index b0e54ec99..6e4022ea6 100644
--- a/src/mem/ruby/structures/CacheMemory.cc
+++ b/src/mem/ruby/structures/CacheMemory.cc
@@ -263,6 +263,13 @@ CacheMemory::allocate(Addr address, AbstractCacheEntry *entry, bool touch)
std::vector<AbstractCacheEntry*> &set = m_cache[cacheSet];
for (int i = 0; i < m_cache_assoc; i++) {
if (!set[i] || set[i]->m_Permission == AccessPermission_NotPresent) {
+ if (set[i] && (set[i] != entry)) {
+ warn_once("This protocol contains a cache entry handling bug: "
+ "Entries in the cache should never be NotPresent! If\n"
+ "this entry (%#x) is not tracked elsewhere, it will memory "
+ "leak here. Fix your protocol to eliminate these!",
+ address);
+ }
set[i] = entry; // Init entry
set[i]->m_Address = address;
set[i]->m_Permission = AccessPermission_Invalid;