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mremap: don't do mm_populate(new_addr) on failure

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move_vma() sets *locked even if move_page_tables() or ->mremap() fails,
change sys_mremap() to check "ret & ~PAGE_MASK".

I think we should simply remove the VM_LOCKED code in move_vma(), that is
why this patch doesn't change move_vma().  But this needs more cleanups.

Signed-off-by: Oleg Nesterov <[email protected]>
Acked-by: David Rientjes <[email protected]>
Cc: Benjamin LaHaise <[email protected]>
Cc: Hugh Dickins <[email protected]>
Cc: Jeff Moyer <[email protected]>
Cc: Kirill A. Shutemov <[email protected]>
Cc: Laurent Dufour <[email protected]>
Cc: Pavel Emelyanov <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Oleg Nesterov 2015-09-04 15:48:07 -07:00 • committed by Linus Torvalds
commit d456fb9e52
1 changed files with 3 additions and 1 deletions
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4
mm/mremap.c
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@ -578,8 +578,10 @@ SYSCALL_DEFINE5(mremap, unsigned long, addr, unsigned long, old_len,
ret = move_vma(vma, addr, old_len, new_len, new_addr, &locked);
}
out:
if (ret & ~PAGE_MASK)
if (ret & ~PAGE_MASK) {
vm_unacct_memory(charged);
locked = 0;
}
up_write(&current->mm->mmap_sem);
if (locked && new_len > old_len)
mm_populate(new_addr + old_len, new_len - old_len);