[PATCH] loop: forward-port resource leak checks from Solar

Forward port of the patch by Solar and ported by Julio.

Compiles, boots, and passes my looptorturetest.sh.

Signed-off-by: Serge E. Hallyn <serue@us.ibm.com>
Cc: Julio Auto <mindvortex@gmail.com>
Cc: Solar Designer <solar@openwall.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 11 insertions, 2 deletions

diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index e87b88731adc..68b0471ad5a6 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -820,13 +820,22 @@ static int loop_set_fd(struct loop_device *lo, struct file *lo_file,
                                                 lo->lo_number);
         if (IS_ERR(lo->lo_thread)) {
                 error = PTR_ERR(lo->lo_thread);
-                lo->lo_thread = NULL;
-                goto out_putf;
+                goto out_clr;
         }
         lo->lo_state = Lo_bound;
         wake_up_process(lo->lo_thread);
         return 0;
 
+out_clr:
+        lo->lo_thread = NULL;
+        lo->lo_device = NULL;
+        lo->lo_backing_file = NULL;
+        lo->lo_flags = 0;
+        set_capacity(disks[lo->lo_number], 0);
+        invalidate_bdev(bdev, 0);
+        bd_set_size(bdev, 0);
+        mapping_set_gfp_mask(mapping, lo->old_gfp_mask);
+        lo->lo_state = Lo_unbound;
  out_putf:
         fput(file);
  out: