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authorAl Viro <viro@zeniv.linux.org.uk>2009-05-08 16:05:57 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2009-05-09 10:51:34 -0400
commit2a32cebd6cbcc43996c3e2d114fa32ba1e71192a (patch)
tree0ad94849a7bc3e97cd19978005d1898c8bb44b36 /drivers/isdn/capi
parentf9dbd05bc97d1d4f17c2057612f6a8e4dbd039e0 (diff)
downloadblackbird-op-linux-2a32cebd6cbcc43996c3e2d114fa32ba1e71192a.tar.gz
blackbird-op-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 'drivers/isdn/capi')
-rw-r--r--drivers/isdn/capi/capifs.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/isdn/capi/capifs.c b/drivers/isdn/capi/capifs.c
index b129409925af..8f9f3b5a3e8c 100644
--- a/drivers/isdn/capi/capifs.c
+++ b/drivers/isdn/capi/capifs.c
@@ -75,8 +75,7 @@ static int capifs_remount(struct super_block *s, int *flags, char *data)
}
}
- kfree(s->s_options);
- s->s_options = new_opt;
+ replace_mount_options(s, new_opt);
config.setuid = setuid;
config.setgid = setgid;
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