Dropping mark reference can result in mark being freed. Although it
should not happen in inotify_remove_from_idr() since caller should hold
another reference, just don't risk lock up just after WARN_ON
unnecessarily. Also fold do_inotify_remove_from_idr() into the single
callsite as that function really is just two lines of real code.
Reviewed-by: Amir Goldstein <amir73il@xxxxxxxxx>
Signed-off-by: Jan Kara <jack@xxxxxxx>
---
fs/notify/inotify/inotify_user.c | 24 ++++++------------------
1 file changed, 6 insertions(+), 18 deletions(-)
diff --git a/fs/notify/inotify/inotify_user.c b/fs/notify/inotify/inotify_user.c
index 3697567c7897..06dae605158d 100644
--- a/fs/notify/inotify/inotify_user.c
+++ b/fs/notify/inotify/inotify_user.c
@@ -397,21 +397,6 @@ static struct inotify_inode_mark *inotify_idr_find(struct fsnotify_group *group,
return i_mark;
}
-static void do_inotify_remove_from_idr(struct fsnotify_group *group,
- struct inotify_inode_mark *i_mark)
-{
- struct idr *idr = &group->inotify_data.idr;
- spinlock_t *idr_lock = &group->inotify_data.idr_lock;
- int wd = i_mark->wd;
-
- assert_spin_locked(idr_lock);
-
- idr_remove(idr, wd);
-
- /* removed from the idr, drop that ref */
- fsnotify_put_mark(&i_mark->fsn_mark);
-}
-
/*
* Remove the mark from the idr (if present) and drop the reference
* on the mark because it was in the idr.
@@ -419,6 +404,7 @@ static void do_inotify_remove_from_idr(struct fsnotify_group *group,
static void inotify_remove_from_idr(struct fsnotify_group *group,
struct inotify_inode_mark *i_mark)
{
+ struct idr *idr = &group->inotify_data.idr;
spinlock_t *idr_lock = &group->inotify_data.idr_lock;
struct inotify_inode_mark *found_i_mark = NULL;
int wd;
@@ -470,13 +456,15 @@ static void inotify_remove_from_idr(struct fsnotify_group *group,
BUG();
}
- do_inotify_remove_from_idr(group, i_mark);
+ idr_remove(idr, wd);
+ /* Removed from the idr, drop that ref. */
+ fsnotify_put_mark(&i_mark->fsn_mark);
out:
+ i_mark->wd = -1;
+ spin_unlock(idr_lock);
/* match the ref taken by inotify_idr_find_locked() */
if (found_i_mark)
fsnotify_put_mark(&found_i_mark->fsn_mark);
- i_mark->wd = -1;
- spin_unlock(idr_lock);
}
/*
--
2.10.2
--
To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
