From 836d5ffd34550901ea024347693e689273ded8aa Mon Sep 17 00:00:00 2001 From: Hugh Dickins Date: Sat, 3 Sep 2005 15:54:53 -0700 Subject: [PATCH] [PATCH] mm: fix madvise vma merging Better late than never, I've at last reviewed the madvise vma merging going into 2.6.13. Remove a pointless check and fix two little bugs - a simple test (with /proc//maps hacked to show ReadHints) showed both mismerges in practice: though being madvise, neither was disastrous. 1. Correct placement of the success label in madvise_behavior: as in mprotect_fixup and mlock_fixup, it is necessary to update vm_flags when vma_merge succeeds (to handle the exceptional Case 8 noted in the comments above vma_merge itself). 2. Correct initial value of prev when starting part way into a vma: as in sys_mprotect and do_mlock, it needs to be set to vma in this case (vma_merge handles only that minimum of cases shown in its comments). 3. If find_vma_prev sets prev, then the vma it returns is prev->vm_next, so it's pointless to make that same assignment again in sys_madvise. Signed-off-by: Hugh Dickins Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/madvise.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/mm/madvise.c b/mm/madvise.c index c8c01a12fea4..4454936f87d1 100644 --- a/mm/madvise.c +++ b/mm/madvise.c @@ -37,7 +37,7 @@ static long madvise_behavior(struct vm_area_struct * vma, if (new_flags == vma->vm_flags) { *prev = vma; - goto success; + goto out; } pgoff = vma->vm_pgoff + ((start - vma->vm_start) >> PAGE_SHIFT); @@ -62,6 +62,7 @@ static long madvise_behavior(struct vm_area_struct * vma, goto out; } +success: /* * vm_flags is protected by the mmap_sem held in write mode. */ @@ -70,7 +71,6 @@ static long madvise_behavior(struct vm_area_struct * vma, out: if (error == -ENOMEM) error = -EAGAIN; -success: return error; } @@ -237,8 +237,9 @@ asmlinkage long sys_madvise(unsigned long start, size_t len_in, int behavior) * - different from the way of handling in mlock etc. */ vma = find_vma_prev(current->mm, start, &prev); - if (!vma && prev) - vma = prev->vm_next; + if (vma && start > vma->vm_start) + prev = vma; + for (;;) { /* Still start < end. */ error = -ENOMEM; -- 2.30.2