From: Herbert Poetzl <herbert@13thfloor.at>
Date: Sun, 26 Mar 2006 09:37:30 +0000 (-0800)
Subject: [PATCH] loop: potential kernel hang waiting for kthread
X-Git-Tag: firefly_0821_release~37049
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=3e88c17d404c5787afd5bd1763380317f5ccbf84;p=firefly-linux-kernel-4.4.55.git

[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>
---

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;