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| author | Al Viro <viro@zeniv.linux.org.uk> | 2009-05-08 22:05:57 +0200 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2009-05-09 16:51:34 +0200 |
| commit | 2a32cebd6cbcc43996c3e2d114fa32ba1e71192a (patch) | |
| tree | 0ad94849a7bc3e97cd19978005d1898c8bb44b36 /fs/afs | |
| parent | switch ufs directories to ufs_sync_file() (diff) | |
| download | linux-2a32cebd6cbcc43996c3e2d114fa32ba1e71192a.tar.xz linux-2a32cebd6cbcc43996c3e2d114fa32ba1e71192a.zip | |
Fix races around the access to ->s_options
Put generic_show_options read access to s_options under rcu_read_lock,
split save_mount_options() into "we are setting it the first time"
(uses in foo_fill_super()) and "we are relacing and freeing the old one",
synchronize_rcu() before kfree() in the latter.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/afs')
| -rw-r--r-- | fs/afs/super.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/afs/super.c b/fs/afs/super.c index 2753f16dd315..76828e5f8a39 100644 --- a/fs/afs/super.c +++ b/fs/afs/super.c @@ -408,17 +408,17 @@ static int afs_get_sb(struct file_system_type *fs_type, deactivate_locked_super(sb); goto error; } - sb->s_options = new_opts; + save_mount_options(sb, new_opts); sb->s_flags |= MS_ACTIVE; } else { _debug("reuse"); - kfree(new_opts); ASSERTCMP(sb->s_flags, &, MS_ACTIVE); } simple_set_mnt(mnt, sb); afs_put_volume(params.volume); afs_put_cell(params.cell); + kfree(new_opts); _leave(" = 0 [%p]", sb); return 0; |