linux-kernel - [PATCH] [efs] Remove incorrect unlock_kernel from failure path in efs_symlink

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Date:	Mon, 24 Jul 2006 14:56:38 -0700
From:	Josh Triplett <josht@...ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	Andrew Morton <akpm@...l.org>
Subject: [PATCH] [efs] Remove incorrect unlock_kernel from failure path in
	efs_symlink_readpage

If efs_symlink_readpage hits the -ENAMETOOLONG error path, it will call
unlock_kernel without ever having called lock_kernel(); fix this by creating
and jumping to a new label fail_notlocked rather than the fail label used
after calling lock_kernel().

Signed-off-by: Josh Triplett <josh@...edesktop.org>
---
This bug exists in the 2.4 kernel series as far back as 2.4.0, and this
patch should apply there as well.

 fs/efs/symlink.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/fs/efs/symlink.c b/fs/efs/symlink.c
index e249cf7..1d30d2f 100644
--- a/fs/efs/symlink.c
+++ b/fs/efs/symlink.c
@@ -22,7 +22,7 @@ static int efs_symlink_readpage(struct f
   
 	err = -ENAMETOOLONG;
 	if (size > 2 * EFS_BLOCKSIZE)
-		goto fail;
+		goto fail_notlocked;
   
 	lock_kernel();
 	/* read first 512 bytes of link target */
@@ -47,6 +47,7 @@ static int efs_symlink_readpage(struct f
 	return 0;
 fail:
 	unlock_kernel();
+fail_notlocked:
 	SetPageError(page);
 	kunmap(page);
 	unlock_page(page);


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