Author: markj
Date: Sat Nov 10 20:36:48 2018
New Revision: 340333
URL: https://svnweb.freebsd.org/changeset/base/340333
Log:
MFC r340241:
Fix a use-after-free in swp_pager_meta_free().
Approved by: re (gjb)
Modified:
stable/12/sys/vm/swap_pager.c
Directory Properties:
stable/12/ (props changed)
Modified: stable/12/sys/vm/swap_pager.c
==============================================================================
--- stable/12/sys/vm/swap_pager.c Sat Nov 10 20:34:59 2018
(r340332)
+++ stable/12/sys/vm/swap_pager.c Sat Nov 10 20:36:48 2018
(r340333)
@@ -1972,13 +1972,13 @@ swp_pager_meta_free(vm_object_t object, vm_pindex_t pi
swp_pager_update_freerange(&s_free, &n_free, sb->d[i]);
sb->d[i] = SWAPBLK_NONE;
}
+ pindex = sb->p + SWAP_META_PAGES;
if (swp_pager_swblk_empty(sb, 0, start) &&
swp_pager_swblk_empty(sb, limit, SWAP_META_PAGES)) {
SWAP_PCTRIE_REMOVE(&object->un_pager.swp.swp_blks,
sb->p);
uma_zfree(swblk_zone, sb);
}
- pindex = sb->p + SWAP_META_PAGES;
}
swp_pager_freeswapspace(s_free, n_free);
}
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