Changeset 560b81c in mainline for kernel/generic/src/ipc/ops/pagein.c

Timestamp:

2016-09-17T15:09:40Z (8 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

ae66564

Parents:

97b8ca9

Message:

Make sure to test the present bit of the found PTE

By design, page_mapping_find() can return true and a copy of a PTE
which is not present. It is therefore necessary to test the found PTE
by PTE_PRESENT() macro.

File:

• kernel/generic/src/ipc/ops/pagein.c (modified) (1 diff)

kernel/generic/src/ipc/ops/pagein.c

@@ -53 +53 @@
                 bool found = page_mapping_find(AS, IPC_GET_ARG1(answer->data),
                     false, &pte);
-                if (found) {
+                if (found & PTE_PRESENT(&pte)) {
                         frame = PTE_GET_FRAME(&pte);
                         pfn_t pfn = ADDR2PFN(frame);