Commit f50b6f8691cae2e0064c499dd3ef3f31142987f0 introduced a
race in autofs4 between autofs_lookup_unhashed() and
autofs_dentry_release().
autofs_dentry_release() ends up clearing the ->dentry and ->inode
members of autofs_info before removing it from the rehash list. The
list is protected by the rehash lock in both functions, but
since autofs_dentry_release() starts tearing the autofs_info struct
down before removing it from the list, autofs_lookup_unhashed() can
get a autofs_info with a NULL dentry.
This patch moves the clearing of ->dentry and ->inode after the removal
from the rehash list.
Signed-off-by: Jeff Mahoney <[email protected]>
---
fs/autofs4/root.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
--- a/fs/autofs4/root.c 2007-04-11 09:41:44.000000000 -0400
+++ b/fs/autofs4/root.c 2007-04-11 10:54:37.000000000 -0400
@@ -470,9 +470,6 @@ void autofs4_dentry_release(struct dentr
if (inf) {
struct autofs_sb_info *sbi = autofs4_sbi(de->d_sb);
- inf->dentry = NULL;
- inf->inode = NULL;
-
if (sbi) {
spin_lock(&sbi->rehash_lock);
if (!list_empty(&inf->rehash))
@@ -480,6 +477,9 @@ void autofs4_dentry_release(struct dentr
spin_unlock(&sbi->rehash_lock);
}
+ inf->dentry = NULL;
+ inf->inode = NULL;
+
autofs4_free_ino(inf);
}
}
--
Jeff Mahoney
SUSE Labs
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