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| author | Andy Lutomirski <luto@amacapital.net> | 2012-07-05 16:00:11 -0700 |
|---|---|---|
| committer | Todd Poynor <toddpoynor@google.com> | 2012-11-27 16:18:13 -0800 |
| commit | 9f818de2fcb87c87874845b5b509b7d406c08eb9 (patch) | |
| tree | 671ff350b1251c62962b743d4520a432f674ca12 /fs/9p/xattr.c | |
| parent | 2982253c3ed8efa5b8146072fe4df0fc2b07d2d9 (diff) | |
| download | kernel_samsung_tuna-9f818de2fcb87c87874845b5b509b7d406c08eb9.zip kernel_samsung_tuna-9f818de2fcb87c87874845b5b509b7d406c08eb9.tar.gz kernel_samsung_tuna-9f818de2fcb87c87874845b5b509b7d406c08eb9.tar.bz2 | |
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")
[bwh: Backported to 3.2:
- Adjust context
- madvise_remove() calls vmtruncate_range(), not do_fallocate()]
[luto: Backported to 3.0: Adjust context]
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: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/9p/xattr.c')
0 files changed, 0 insertions, 0 deletions