[PATCH] loop: potential kernel hang waiting for kthread

Check that kernel_thread() succeeded, so we don't wait for something which
cannot happen.

Signed-off-by: Herbert Poetzl <herbert@13thfloor.at>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 74bf0255e98f..9c3b94e8f03b 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -839,7 +839,9 @@ static int loop_set_fd(struct loop_device *lo, struct file *lo_file,
 
         set_blocksize(bdev, lo_blocksize);
 
-        kernel_thread(loop_thread, lo, CLONE_KERNEL);
+        error = kernel_thread(loop_thread, lo, CLONE_KERNEL);
+        if (error < 0)
+                goto out_putf;
         wait_for_completion(&lo->lo_done);
         return 0;