linux-kernel - Re: [PATCH 04/27] Driver core: devtmpfs: prevent concurrent subdirectory creation and removal

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Date:	Tue, 22 Dec 2009 22:25:16 +0100
From:	Kay Sievers <kay.sievers@...y.org>
To:	"Kirill A. Shutemov" <kirill@...temov.name>
Cc:	Greg Kroah-Hartman <gregkh@...e.de>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 04/27] Driver core: devtmpfs: prevent concurrent
 subdirectory creation and removal

On Tue, 2009-12-22 at 20:56 +0200, Kirill A. Shutemov wrote:
> On Tue, Dec 22, 2009 at 6:57 PM, Kay Sievers <kay.sievers@...y.org> wrote:
> > On Tue, Dec 22, 2009 at 15:10, Kirill A. Shutemov <kirill@...temov.name> wrote:
> >> On Mon, Dec 21, 2009 at 4:37 PM, Kay Sievers <kay.sievers@...y.org> wrote:
> >>> On Mon, Dec 21, 2009 at 14:37, Kirill A. Shutemov <kirill@...temov.name> wrote:
> >>>> v2.6.33-rc1-96-gdd59f6c:
> >>>> I guess it can be related to this commit.
> >>>
> >>> The fix is already pending here:
> >>>  http://patchwork.kernel.org/patch/68337/
> >>
> >> One more problem: you don't unlock dirlock if kstrdup() failed.
> >
> > Oh right, will send a fix tomorrow.
> 
> Reported-by Kirill A. Shutemov <kirill@...temov.name>

Thanks!

Kay



From: Kay Sievers <kay.sievers@...y.org>
Subject: devtmpfs: unlock mutex in case of string allocation error

Reported-by: Kirill A. Shutemov <kirill@...temov.name>
Signed-off-by: Kay Sievers <kay.sievers@...y.org>
---
 drivers/base/devtmpfs.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

--- a/drivers/base/devtmpfs.c
+++ b/drivers/base/devtmpfs.c
@@ -101,8 +101,10 @@ static int create_path(const char *nodep
 
 		/* parent directories do not exist, create them */
 		path = kstrdup(nodepath, GFP_KERNEL);
-		if (!path)
-			return -ENOMEM;
+		if (!path) {
+			err = -ENOMEM;
+			goto out;
+		}
 		s = path;
 		for (;;) {
 			s = strchr(s, '/');
@@ -117,6 +119,7 @@ static int create_path(const char *nodep
 		}
 		kfree(path);
 	}
+out:
 	mutex_unlock(&dirlock);
 	return err;
 }


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