Skip to content

Bound the LRUN page count in the realloc shrink path #23774

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
jvoisin wants to merge 1 commit into
base: master
Choose a base branch
from
+3 −0
Open

Bound the LRUN page count in the realloc shrink path #23774

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
3 changes: 3 additions & 0 deletions Zend/zend_alloc.c
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -1831,6 +1831,9 @@ static zend_always_inline void *zend_mm_realloc_heap(zend_mm_heap *heap, void *p
} else {
ZEND_MM_CHECK(info & ZEND_MM_IS_LRUN, "zend_mm_heap corrupted");
ZEND_MM_CHECK(ZEND_MM_ALIGNED_OFFSET(page_offset, ZEND_MM_PAGE_SIZE) == 0, "zend_mm_heap corrupted");
/* The decoded run length drives a free_map reset in the shrink path
* below; an out-of-range count would reach past it into the chunk header. */
ZEND_MM_CHECK(page_num + ZEND_MM_LRUN_PAGES(info) <= ZEND_MM_PAGES, "zend_mm_heap corrupted");
old_size = ZEND_MM_LRUN_PAGES(info) * ZEND_MM_PAGE_SIZE;
if (size > ZEND_MM_MAX_SMALL_SIZE && size <= ZEND_MM_MAX_LARGE_SIZE) {
new_size = ZEND_MM_ALIGNED_SIZE_EX(size, ZEND_MM_PAGE_SIZE);
Expand Down
Loading