linux-kernel - [PATCH] autofs: don't stuck in a loop if vfs

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Message-ID: <20160616083108.6278.65815.stgit@pluto.themaw.net>
Date:	Thu, 16 Jun 2016 16:31:08 +0800
From:	Ian Kent <raven@...maw.net>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	autofs mailing list <autofs@...r.kernel.org>,
	Andrey Vagin <avagin@...nvz.org>,
	Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH] autofs: don't stuck in a loop if vfs_write returns an error

From: Andrey Vagin <avagin@...nvz.org>

__vfs_write() returns a negative value in a error case.

Signed-off-by: Andrey Vagin <avagin@...nvz.org>
Signed-off-by: Ian Kent <raven@...maw.net>
---
 fs/autofs4/waitq.c |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/fs/autofs4/waitq.c b/fs/autofs4/waitq.c
index 0146d91..631f155 100644
--- a/fs/autofs4/waitq.c
+++ b/fs/autofs4/waitq.c
@@ -66,11 +66,12 @@ static int autofs4_write(struct autofs_sb_info *sbi,
 	set_fs(KERNEL_DS);
 
 	mutex_lock(&sbi->pipe_mutex);
-	wr = __vfs_write(file, data, bytes, &file->f_pos);
-	while (bytes && wr) {
+	while (bytes) {
+		wr = __vfs_write(file, data, bytes, &file->f_pos);
+		if (wr <= 0)
+			break;
 		data += wr;
 		bytes -= wr;
-		wr = __vfs_write(file, data, bytes, &file->f_pos);
 	}
 	mutex_unlock(&sbi->pipe_mutex);