linux-kernel - [ 38/50] ipc,shm: cleanup do

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Message-Id: <20131016174402.980056304@linuxfoundation.org>
Date:	Wed, 16 Oct 2013 10:45:24 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Davidlohr Bueso <davidlohr.bueso@...com>,
	Sedat Dilek <sedat.dilek@...il.com>,
	Rik van Riel <riel@...hat.com>,
	Manfred Spraul <manfred@...orfullife.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Mike Galbraith <efault@....de>
Subject: [ 38/50] ipc,shm: cleanup do_shmat pasta

3.11-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Davidlohr Bueso <davidlohr.bueso@...com>

commit f42569b1388b1408b574a5e93a23a663647d4181 upstream.

Clean up some of the messy do_shmat() spaghetti code, getting rid of
out_free and out_put_dentry labels.  This makes shortening the critical
region of this function in the next patch a little easier to do and read.

Signed-off-by: Davidlohr Bueso <davidlohr.bueso@...com>
Tested-by: Sedat Dilek <sedat.dilek@...il.com>
Cc: Rik van Riel <riel@...hat.com>
Cc: Manfred Spraul <manfred@...orfullife.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Mike Galbraith <efault@....de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 ipc/shm.c |   26 ++++++++++++--------------
 1 file changed, 12 insertions(+), 14 deletions(-)

--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -1115,16 +1115,21 @@ long do_shmat(int shmid, char __user *sh
 
 	err = -ENOMEM;
 	sfd = kzalloc(sizeof(*sfd), GFP_KERNEL);
-	if (!sfd)
-		goto out_put_dentry;
+	if (!sfd) {
+		path_put(&path);
+		goto out_nattch;
+	}
 
 	file = alloc_file(&path, f_mode,
 			  is_file_hugepages(shp->shm_file) ?
 				&shm_file_operations_huge :
 				&shm_file_operations);
 	err = PTR_ERR(file);
-	if (IS_ERR(file))
-		goto out_free;
+	if (IS_ERR(file)) {
+		kfree(sfd);
+		path_put(&path);
+		goto out_nattch;
+	}
 
 	file->private_data = sfd;
 	file->f_mapping = shp->shm_file->f_mapping;
@@ -1150,7 +1155,7 @@ long do_shmat(int shmid, char __user *sh
 		    addr > current->mm->start_stack - size - PAGE_SIZE * 5)
 			goto invalid;
 	}
-		
+
 	addr = do_mmap_pgoff(file, addr, size, prot, flags, 0, &populate);
 	*raddr = addr;
 	err = 0;
@@ -1174,19 +1179,12 @@ out_nattch:
 	else
 		shm_unlock(shp);
 	up_write(&shm_ids(ns).rw_mutex);
-
-out:
 	return err;
 
 out_unlock:
 	shm_unlock(shp);
-	goto out;
-
-out_free:
-	kfree(sfd);
-out_put_dentry:
-	path_put(&path);
-	goto out_nattch;
+out:
+	return err;
 }
 
 SYSCALL_DEFINE3(shmat, int, shmid, char __user *, shmaddr, int, shmflg)


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