diff options
| author | Andy Lutomirski <luto@amacapital.net> | 2012-07-05 16:00:11 -0700 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2012-07-12 04:32:19 +0100 |
| commit | 1935549ba38cf30ebe8748ccb88fb99d009241d4 (patch) | |
| tree | 9670b6c22ff039161f2b0650572c48c788a41625 /fs/btrfs/backref.c | |
| parent | 6d60474a0f04010b7b9446abe68bcf2fb772c9bd (diff) | |
mm: Hold a file reference in madvise_remove
commit 9ab4233dd08036fe34a89c7dc6f47a8bf2eb29eb upstream.
Otherwise the code races with munmap (causing a use-after-free
of the vma) or with close (causing a use-after-free of the struct
file).
The bug was introduced by commit 90ed52ebe481 ("[PATCH] holepunch: fix
mmap_sem i_mutex deadlock")
Cc: Hugh Dickins <hugh@veritas.com>
Cc: Miklos Szeredi <mszeredi@suse.cz>
Cc: Badari Pulavarty <pbadari@us.ibm.com>
Cc: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
[bwh: Backported to 3.2:
- Adjust context
- madvise_remove() calls vmtruncate_range(), not do_fallocate()]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'fs/btrfs/backref.c')
0 files changed, 0 insertions, 0 deletions