aboutsummaryrefslogtreecommitdiff
path: root/mm/mremap.c
diff options
context:
space:
mode:
authorAl Viro <viro@zeniv.linux.org.uk>2015-04-06 17:48:54 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2015-04-06 17:50:59 -0400
commitb2edffdd912b4205899a8efa0974dfbbc3216109 (patch)
tree64f8f993ab48978b5a3a13912bba685d48b1a04e /mm/mremap.c
parent8f778bbc542ddf8f6243b21d6aca087e709cabdc (diff)
downloadlinux-stericsson-b2edffdd912b4205899a8efa0974dfbbc3216109.tar.gz
fix mremap() vs. ioctx_kill() race
teach ->mremap() method to return an error and have it fail for aio mappings in process of being killed Note that in case of ->mremap() failure we need to undo move_page_tables() we'd already done; we could call ->mremap() first, but then the failure of move_page_tables() would require undoing whatever _successful_ ->mremap() has done, which would be a lot more headache in general. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'mm/mremap.c')
-rw-r--r--mm/mremap.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/mm/mremap.c b/mm/mremap.c
index 57dadc025c64..2dc44b1cb1df 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -286,8 +286,14 @@ static unsigned long move_vma(struct vm_area_struct *vma,
old_len = new_len;
old_addr = new_addr;
new_addr = -ENOMEM;
- } else if (vma->vm_file && vma->vm_file->f_op->mremap)
- vma->vm_file->f_op->mremap(vma->vm_file, new_vma);
+ } else if (vma->vm_file && vma->vm_file->f_op->mremap) {
+ err = vma->vm_file->f_op->mremap(vma->vm_file, new_vma);
+ if (err < 0) {
+ move_page_tables(new_vma, new_addr, vma, old_addr,
+ moved_len, true);
+ return err;
+ }
+ }
/* Conceal VM_ACCOUNT so old reservation is not undone */
if (vm_flags & VM_ACCOUNT) {