locks: fix file_lock deletion inside loop

locks_delete_lock_ctx() is called inside the loop, so we
should use list_for_each_entry_safe.

Fixes: 8634b51f6ca2 (locks: convert lease handling to file_lock_context)
Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Jeff Layton <jeff.layton@primarydata.com>

diff --git a/fs/locks.c b/fs/locks.c
index 528fedf..40bc384 100644 (file)
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -1388,9 +1388,8 @@ any_leases_conflict(struct inode *inode, struct file_lock *breaker)
 int __break_lease(struct inode *inode, unsigned int mode, unsigned int type)
 {
        int error = 0;
-       struct file_lock *new_fl;
        struct file_lock_context *ctx = inode->i_flctx;
-       struct file_lock *fl;
+       struct file_lock *new_fl, *fl, *tmp;
        unsigned long break_time;
        int want_write = (mode & O_ACCMODE) != O_RDONLY;
        LIST_HEAD(dispose);
@@ -1420,7 +1419,7 @@ int __break_lease(struct inode *inode, unsigned int mode, unsigned int type)
                        break_time++;   /* so that 0 means no break time */
        }
 
-       list_for_each_entry(fl, &ctx->flc_lease, fl_list) {
+       list_for_each_entry_safe(fl, tmp, &ctx->flc_lease, fl_list) {
                if (!leases_conflict(fl, new_fl))
                        continue;
                if (want_write) {